Choice D is the best answer because it most logically completes the text’s
discussion of the twelfth-century Islamic philosopher Ibn Rushd. As used in this
context, “inconsequential to” means not significant to. According to the text, Ibn
Rushd’s works were primarily available in Spain, where he lived, far from central
areas of the Muslim world, a fact that could support the conclusion that his
influence on Muslim contemporaries was limited. The text implies, however, that
recent scholarship has shown that his works still had an impact on other Muslim
philosophers of his time. This context supports the idea that his works weren’t
inconsequential to Islamic thought in this period.
Choice A is incorrect because the issue under consideration in the text is
whether other Muslim philosophers of Ibn Rushd’s time had access to his works,
not whether his works were “controversial among,” or causing dispute among,
other philosophers. Choice B is incorrect. The text implies that other Muslim
philosophers of Ibn Rushd’s era were aware of his works, not that they were
“antagonistic toward,” or hostile toward, them. There is no suggestion that Ibn
Rushd’s writings elicited hostility from his contemporaries. Choice C is incorrect
because in this context, “imitated by” would mean followed as a model by.
Although the text implies that Ibn Rushd’s works were at least somewhat available
in regions that were at the center of Islamic thought during the period, it doesn’t
specifically address in what ways his works influenced contemporary Muslim
philosophers. Thus, the text doesn’t support the idea that other philosophers
modeled their own works after Ibn Rushd’s works.

Choice A is the best answer because it most accurately describes the function
of the underlined sentence in the text as a whole. The first sentence of the text
indicates that Johnson returned to the US in 1938 at which time his painting
style suddenly changed. The second sentence is underlined and gives more
detail about this stylistic change, noting that his earlier work consisted largely
of landscapes in an expressionist style and his new works were highly stylized
portraits of Black Americans. In other words, the function of the underlined
sentence is to elaborate on a transitional moment in Johnson’s painting career.
Choice B is incorrect. Although the text does mention that Johnson spent a
decade in Europe, it does not discuss what other travel Johnson might have done.
Furthermore, although the text mentions African, American, and Scandinavian
artistic elements in Johnson’s work, it does not indicate that he traveled to
different locations to learn about these practices. Choice C is incorrect because
the text does not focus on Johnson’s personal life nor does it address how
successful his career was in general. Choice D is incorrect because, rather
than call it into question, the underlined sentence continues the discussion
of Johnson’s career by adding further relevant detail of Johnson’s artistic
transformation.

Choice B is the best answer because it most accurately describes the main
purpose of the text, which is to establish that pianist Martha Argerich’s
performances appear easy because of her work to prepare for them. The text
begins by stating that Argerich plays in such a way that it looks like the music
is coming to her naturally in the moment, without planning. It goes on to point
out that despite her skill and experience, Argerich works tirelessly and treats
each piece of music as if it is new each time she performs it, and that it is this
preparation that causes her playing to appear relaxed and natural. These details
establish that the purpose of the text is to assert that Argerich’s performances
look effortless because of how she prepares for them.
Choice A is incorrect because the text doesn’t address how Argerich selects the
music she’ll perform; instead, it describes how she approaches a piece of music
in preparation for a performance. Choice C is incorrect because the text doesn’t
discuss kinds of music beyond stating that Argerich is a classical pianist, and it
doesn’t mention Argerich actually encountering any music for the first time; it
indicates only that she approaches a piece of music she is going to perform as
if she has never played it before. Choice D is incorrect because the text doesn’t
mention music that Argerich is actually performing for the first time, only that
Argerich approaches the pieces she performs as if they are new each time;
further, the text doesn’t characterize this approach as unique, or something only
Argerich does.

Choice B is the best answer because it best describes the function of the
underlined portion in the text as a whole. The text describes the failed attempt of
Israel Potter to establish a farm in New England during the late eighteenth century:
according to his contract, he was to receive two hundred acres in exchange for
three months’ work, but his employer then refused to fulfill the bargain and Israel
had no recourse to law to obtain the land he was owed. Israel was therefore
forced to find another means of supporting himself. To explain why Israel was
particularly susceptible to his employer’s dishonesty, the underlined portion
states that though Israel was “brave-hearted, and even much of a dare-devil upon
a pinch,” he also possessed “a singular patience and mildness.” In other words,
Israel could be courageous in certain circumstances, but he was usually meek
and disinclined to argument, from which it is reasonable to infer that Israel was
often taken advantage of. Thus, the underlined portion suggests that if not for a
certain aspect of his character, Israel might not have been as easily thwarted in
his ambition to establish a farm.
Choice A is incorrect because although the underlined portion describes
aspects of Israel’s personality, it does not address how he feels about his own
personality. Choice C is incorrect because the underlined portion addresses
Israel’s occasional courage and frequent meekness but does not address
whether he would have the skills and resolve necessary to operate a farm if he
owned sufficient property. Choice D is incorrect. Though the underlined portion
does indicate that Israel could be courageous in certain circumstances, it does
not say that he undertook acts of courage that others avoided, but rather that
he was habitually meek. Even if the underlined portion did say that Israel was
more courageous than most, this would not explain why he found himself under
the circumstances described in the text—that is, as a consequence of his meek
nature, cheated of the property to which he had a right.

Choice D is the best answer because it reflects how the author of Text 2 would
most likely respond to the underlined claim in Text 1. Text 1 begins by noting
the success of The Nutcracker but then claims that the ballet is “stuck in the
past” and should “no longer be produced.” Text 2 begins by conceding that The
Nutcracker is indeed outdated but argues that it should continue to be performed,
states that the show can be updated to include more contemporary dance
styles, and provides an example of one such modernized version, Hot Chocolate
Nutcracker. Hence, the author of Text 2 would most likely respond to the
underlined claim in Text 1 by suggesting that dance companies should consider
offering revised versions of The Nutcracker instead of completely rejecting the
show.
Choice A is incorrect because the author of Text 2 advocates for using creative
ways to update The Nutcracker and therefore wouldn’t respond to the underlined
claim by rejecting the suggestion that contemporary audiences would enjoy
an updated version. Choice B is incorrect because although the authors of
both texts claim that The Nutcracker is outdated, neither text suggests that
contemporary audiences have largely stopped attending productions of the
show. On the contrary, Text 2 states that The Nutcracker is a holiday favorite and
generates substantial income for some dance companies. Choice C is incorrect
because although Text 2 provides an example of a contemporized version of The
Nutcracker, the text doesn’t suggest that offering modernized versions is a way to
increase income for most dance companies. Rather, the author of Text 2 suggests
that offering modernized versions is a way to make the ballet discussed in Text 1
feel less outdated.

Choice D is the best answer because it most accurately states the main idea of
the text. The text indicates that archaeologist Mª Ángeles Medina-Alcaide and
her team used replicas of Paleolithic light sources to understand how Paleolithic
artists moved through dark caves. The researchers learned, for example, that
torches were more helpful for moving through caves than animal-fat lamps
were. Thus, the main idea of the text is that Medina-Alcaide and her team tested
Paleolithic light sources and learned some details about how Paleolithic artists
traveled within dark caves.
Choice A is incorrect because the text doesn’t address the usefulness of
fireplaces for Paleolithic cave artists; it only mentions fireplaces briefly as one of
the three lighting methods the researchers tested. Choice B is incorrect because
the text doesn’t discuss how often Paleolithic cave artists used each kind of light
source tested. Although the text does compare animal-fat lamps with another
lighting method, the point of that comparison is that animal-fat lamps were less
useful than torches when walking, not that one method was used more often
than another. Choice C is incorrect because the text doesn’t discuss either how
difficult it was for Medina-Alcaide and her team to replicate light sources or how
the team felt about drawing conclusions from their study. Instead, the text reveals
that the team was able to conclude that each light source likely had a distinct
purpose

Choice A is the best answer because it most effectively uses data from the table
to complete the statement about the US auto industry in the early twentieth
century. The table shows the number of cars produced annually and number
of companies producing cars in the United States between 1910 and 1925 in
increments of five years. According to the table, the number of cars produced
consistently increased from one increment to the next, going from 123,990 cars
in 1910 to 3,185,881 cars in 1925. At the same time, the table shows that the
number of companies producing cars consistently decreased, going from 320
companies in 1910 to only 80 companies in 1925. Thus, the table shows that the
number of cars produced increased from 1910 to 1925, even as the number of
companies producing cars decreased.
Choice B is incorrect. The table shows that the number of cars produced in the US
increased, going from 123,990 in 1910 to 3,185,881 in 1925, instead of remaining
unchanged, and the table also shows that the number of companies producing
cars decreased from 320 to 80 instead of remaining unchanged. Choice C
is incorrect because the table indicates that the number of cars produced
consistently increased from 1910 to 1925, going from 123,990 cars to 3,185,881
cars, instead of decreasing; moreover, the table shows that the number of
companies producing cars from 1910 to 1925 declined from 320 to 80 instead of
remaining unchanged. Choice D is incorrect because the table indicates that the
number of companies producing cars consistently decreased from 1910 to 1925,
going from 320 companies to only 80 companies.

Choice A is the best answer because it best supports the researchers’
explanation of the results of rearranging a store’s layout. According to the text,
Sam K. Hui and colleagues found that rearranging a store’s layout can encourage
customers to make spontaneous purchases. The text states that the researchers
explain that a change in layout causes shoppers to hunt for items’ new locations,
which exposes the shoppers to more products and increases the likelihood that
they’ll make an unplanned purchase. This quotation from a surveyed shopper
indicates that the shopper spontaneously purchased a notebook while looking
for cleaning supplies that weren’t in their usual place. The quotation therefore
supports the researchers’ explanation that rearranging a store’s layout can lead
shoppers to make unanticipated purchases.
Choice B is incorrect because it doesn’t support the researchers’ explanation that
rearranging a store’s layout can lead shoppers to make unanticipated purchases.
Instead of attributing an unplanned purchase to a change in layout, the quotation
notes that the shopper searched for but couldn’t find some items, and as a result
the shopper purchased less, not more, than what was anticipated. Choice C is
incorrect because the quotation attributes what was purchased to coupons that
the shopper received, not to a new store layout. Thus, the quotation doesn’t
support the researchers’ explanation that rearranging a store’s layout can lead
shoppers to make unanticipated purchases. Choice D is incorrect because the
quotation attributes what was purchased to the size and stock of the store, not
to a new store layout. The shopper simply purchased products that the shopper
wanted in a particular store because other stores didn’t carry those products,
so the quotation doesn’t support the researchers’ explanation that rearranging a
store’s layout can lead shoppers to make spontaneous purchases.

Choice A is the best answer because it presents a statement that, if true, would
support the claim that the two exhibitions This Is the Day and The Dirty South
showcase the diverse media artists have used to represent the Black experience
in the US. The text describes the thematic focus of the two exhibitions: religious
and spiritual expressions in the Black community and the connections between
visual arts and music in Black culture in the American South between 1920 and
2020. If these exhibits included works created with many different materials and
means of artistic expression (such as paint, textiles, sculptural stone, and musical
forms), they would display how artists have portrayed and responded to the Black
experience in the US as well as the variety of media that these artists have used
to do so.
Choice B is incorrect because it focuses on the number of artists whose works
were included in the exhibitions, not on the means of expression that these
artists have used. Therefore, the statement wouldn’t address the claim that
the exhibits showcased the different media artists have used to represent the
Black experience in the US. Choice C is incorrect because it focuses on how
the works that were included in the exhibitions were sourced, not on the means
of expression the artists whose works were featured have used. Therefore, the
statement wouldn’t address the claim that the exhibits showcased the different
media artists have used to represent the Black experience in the US. Choice D is
incorrect. Although the statement focuses on similarities in the themes of the two
exhibitions—that is, they both concern the Black experience in the US—it doesn’t
mention the media that artists whose works were featured in the exhibitions have
used to portray and respond to this experience.

Choice D is the best answer because it presents a finding that, if true, would
support the researchers’ hypothesis that TMAO reduces water’s compressibility.
The text explains that at great depths in the ocean, extreme pressure compresses
the molecular structure of water by destabilizing the hydrogen bonds between
adjacent molecules, thereby allowing water to penetrate proteins and harm the
associated organisms. However, deep-sea organisms called piezophiles have
adapted to live at these depths and previous studies show a positive correlation
between the depth at which a piezophile species lives and the species’ level of
the compound TMAO. Because this hypothesis links TMAO levels with reduced
compressibility of water’s tetrahedral molecular structure, a finding that TMAO
helps maintain the hydrogen bonds between water molecules under high
pressure would strongly support that hypothesis.
Choice A is incorrect. Although the researchers’ hypothesis suggests a
relationship between TMAO and water molecules’ tetrahedral molecular structure,
that relationship involves TMAO helping maintain water’s tetrahedral molecular
structure under high pressure; as presented in the text, the hypothesis doesn’t
contend that water molecules are impervious to, or incapable of being penetrated
by, TMAO. Choice B is incorrect because the text discusses how the molecular
structure of water, not TMAO, is compressed under extreme pressure and never
addresses how TMAO might be affected by such pressure. Choice C is incorrect
because the researchers’ hypothesis holds that water under extreme pressure
is more resistant, not less, to being compressed when TMAO concentrations
are higher. Moreover, the positive correlation mentioned in the text is between
TMAO concentrations and the depths at which piezophiles live, not between
concentrations of TMAO and the rate at which water’s molecular structure
compresses as pressure increases.

Choice D is the best answer because it most logically completes the text’s
discussion of the Cretaceous pterosaur Tupandactylus navigans. The text first
describes what paleontologists initially speculated to be true of T. navigans
based on observing only fossilized skulls of the pterosaur rather than complete
skeletons—namely, that T. navigans had an oversized head crest and that, like
other pterosaurs, its main mode of movement must have been flight. The text
goes on to describe what researcher Victor Beccari and his team concluded
based on studying a nearly complete fossilized skeleton of T. navigans, which
provided additional information that fossilized skulls alone could not. Beccari
and colleagues determined that T. navigans had long hind legs, short wings,
and an unusually long neck, in addition to the oversized head crest previously
observed by paleontologists. Taken together, these characteristics would have
made sustained flight difficult and upright walking comfortable, which would
make T. navigans different from other pterosaurs that moved mainly through
flight. Thus, Beccari and colleagues suggest that previously held speculations of
paleontologists are inaccurate: that instead of moving mainly through powered
flight, T. navigans likely flew for shorter distances and spent more time walking
than researchers previously thought.
Choice A is incorrect because Beccari and his team determined, based on
their examination of a nearly complete skeleton, that T. navigans would have
found “sustained flight difficult,” which would differentiate it from most other
pterosaurs that moved mainly through flight. Therefore, Beccari’s team would
not suggest that T. navigans flew for longer distances than did other pterosaur
species with large head crests. Choice B is incorrect because the fossilized
skeleton studied by Beccari and colleagues was notable for its short wings, and
because no indication in the text is made that other pterosaurs were thought
by paleontologists to be comfortable walking. Therefore, Beccari’s team would
not suggest that T. navigans had longer wings than other pterosaur species
considered to have been comfortable walking. Choice C is incorrect because the
text indicates that Beccari and his team agree with the paleontologists mentioned
earlier in the text that T. navigans had a large-crested head. Therefore, Beccari’s
team would not suggest that T. navigans had a smaller head than researchers
previously expected.

Choice B is the best answer because it most logically completes the text’s
discussion of a study involving ethical consumers. According to the text, ethical
consumers are people who strive to purchase goods and services with positive or
neutral effects on society and the environment. The text explains that consumer
psychologists believe these consumers are more likely to purchase a product
if its effects correspond better to their values. The text then introduces a study
of ethical consumers’ attitudes toward a specific mobile phone, indicating that
participants in their twenties had a less positive attitude toward the phone’s
effects on society and the environment than participants in other age groups
did. The text indicates that readers should assume there are no other differences
between the participants in their twenties and those in other age groups. If
the consumer psychologists’ theory is correct, as the text proposes, then the
study’s finding suggests that ethical consumers in their twenties are less likely to
purchase the phone than ethical consumers in other age groups are.
Choice A is incorrect because the text mentions only the mobile phone used
in the study and therefore provides no basis to compare participants’ attitudes
toward that phone with their attitudes toward any other phone. Choice C is
incorrect because the study’s finding suggests the contrary. The text indicates
that study participants in their twenties had a less positive attitude toward the
phone’s social and environmental effects than study participants in other age
groups did. If the consumer psychologists’ theory is true, as the text proposes,
then the study’s finding suggests that ethical consumers in their twenties are
meaningfully less likely to purchase the phone than ethical consumers in other
age groups are. Choice D is incorrect because there’s nothing in the text to
suggest that ethical consumers in their twenties are more likely than ethical
consumers in other age groups to consider a phone’s social and ecological
effects when deciding whether to purchase it. Rather, the text’s discussion of
people who identify as ethical consumers suggests that they all consider the
social and ecological effects of products, regardless of age

Choice A is the best answer. The convention being tested is the use of verb forms
within a sentence. The nonfinite past participle “created” is correctly used to form
a supplementary element that modifies the noun phrase “the saloon,” identifying
who established the Boston Saloon.
Choice B is incorrect because it results in an ungrammatical sentence. The finite
present tense verb “creates” can’t be used in this way to form a supplementary
element to modify the noun phrase “the saloon.” Choice C is incorrect because it
results in an ungrammatical sentence. The nonfinite present participle “creating”
can’t be used in this way to form a supplementary element to modify the noun
phrase “the saloon.” Choice D is incorrect because it results in an ungrammatical
sentence. The finite present tense verb “create” can’t be used in this way to form a
supplementary element to modify the noun phrase “the saloon.”

Choice C is the best answer. The convention being tested is punctuation use
between a verb and an object. No punctuation is needed between the verb
“popularized” and its object “the use of Jamaican Creole.” The object helps
complete the idea of the verb—in this case, it explains what Louise Bennett
popularized—and any punctuation between the two results in an ungrammatical
sentence.
Choice A is incorrect because no punctuation is needed between the verb and its
object. Choice B is incorrect because no punctuation is needed between the verb
and its object. Choice D is incorrect because no punctuation is needed between
the verb and its object.

Choice D is the best answer. The convention being tested is subject-verb
agreement. The singular verb “creates” agrees in number with the singular subject
“technique.”
Choice A is incorrect because the plural verb “create” doesn’t agree in number
with the singular subject “technique.” Choice B is incorrect because the plural
verb “are creating” doesn’t agree in number with the singular subject “technique.”
Choice C is incorrect because the plural verb “have created” doesn’t agree in
number with the singular subject “technique.”

Choice A is incorrect because it results in a run-on sentence. The sentences
(“Jamaican…microsculptures” and “Creations…strands”) are fused without
punctuation and/or a conjunction. Choice B is incorrect because it results in a
comma splice. A comma can’t be used in this way to mark the boundary between
sentences. Choice D is incorrect. Without a comma preceding it, the conjunction
“and” can’t be used in this way to join sentences.

Choice A is incorrect because it results in a run-on sentence. The two sentences
(“A ray…works” and “Because…image”) are fused without punctuation and/or a
conjunction. Choice C is incorrect because it results in a comma splice. A comma
can’t be used in this way to mark the boundary between sentences. Choice D is
incorrect because it results in a comma splice. Since the contraction “it’s” creates
a main clause, the comma after “single ray” can’t be used in this way to mark the
boundary between two main clauses (“it’s…ray” and “all light…image”).

Choice A is incorrect because “previously” illogically signals that the idea in
this sentence occurs before the action in the first sentence. Instead, the use
of “lyfe” is an alternative to the previously mentioned use of “life.” Choice B is
incorrect because “regardless” illogically signals that the idea in this sentence
is true despite the information in the first sentence. Instead, the use of “lyfe” is
an alternative to the previously mentioned use of “life.” Choice C is incorrect
because “there” illogically signals that the idea in this sentence occurs in a place
mentioned in the previous sentence. Instead, the use of “lyfe” is an alternative to
the previously mentioned use of “life.”

Choice A is incorrect because “additionally” illogically signals that the information
in the sentence is merely an additional fact related to the information about
the museum before the new gallery opened. Instead, the sentence is about the
museum in the present day after the new gallery opened. Choice B is incorrect
because “for example” illogically signals that the information in the sentence
exemplifies the previous information about the museum before the new gallery
opened. Instead, the sentence is about the museum in the present day after the
new gallery opened. Choice C is incorrect because “nevertheless” illogically
signals that the information in the sentence is true despite the previous
information about the museum before the new gallery opened. Instead, the
sentence is about the museum in the present day after the new gallery opened.

Choice C is the best answer. “On the other hand” logically signals that the information in the sentence—that the snowpack at higher elevations in the Chuska Mountains was deepest in mid-March—contrasts with the previous information about the snowpack at lower elevations being deepest in early March.

Choice A is incorrect because “in other words” illogically signals that information in the sentence is merely a paraphrase or restatement of the previous information about the snowpack at lower elevations. Instead, the information about the snowpack at higher elevations contrasts with that information. Choice B is incorrect because “for instance” illogically signals that the information in the sentence exemplifies the previous information about the snowpack at lower elevations. Instead, the information about the snowpack at higher elevations
contrasts with that information. Choice D is incorrect because “in summary” illogically signals that the information in the sentence summarizes the previous information about the snowpack at lower elevations. Instead, the information about the snowpack at higher elevations contrasts with that information

Choice A is incorrect because “as a result” illogically signals that the claim in the
sentence is a consequence or result of the previous statement about the Incas
using quipus to record countable information. Instead, the possibility that the Inca
used quipus to record more complex information is an additional point about how
the quipus were used. Choice B is incorrect because “in other words” illogically
signals that the claim in the sentence is merely a paraphrase or restatement of the
previous statement about the Incas using quipus to record countable information.
Instead, the possibility that the Inca used quipus to record more complex
information is an additional point about how the quipus were used. Choice D is
incorrect because “for example” illogically signals that the claim in the sentence
exemplifies the previous statement about the Incas using quipus to record
countable information. Instead, the possibility that the Inca used quipus to record
more complex information is an additional point about how the quipus were used.

Choice A is incorrect because “however” illogically signals that the claim in this
sentence contrasts with the previous information about the ideas circulating
among British scientists in the 1800s. Instead, this claim follows logically from
that information. Choice C is incorrect because “moreover” illogically signals
that the claim in this sentence merely adds to the previous information about the
ideas circulating among British scientists in the 1800s. Instead, this claim follows
logically from that information. Choice D is incorrect because “for example”
illogically signals that this sentence provides an example supporting the previous
information about the ideas circulating among British scientists in the 1800s.
Instead, it presents a claim that follows logically from that information.

Choice C is the best answer. The convention being tested is the coordination of
main clauses within a sentence. This choice uses a semicolon in a conventional
way to join the first main clause (“Clear… through”) and the second main clause
(“wax…through”).

Choice A is incorrect because it results in a comma splice. Without a conjunction
following it, a comma can’t be used in this way to join two main clauses. Choice B
is incorrect because it results in a run-on sentence. The two main clauses
(“Clear…through” and “wax…through”) are fused without punctuation and/or a
conjunction. Furthermore, it results in a confusing and illogical sentence that
suggests clear glass allows light to pass through wax paper, which doesn’t make
sense in this context. Choice D is incorrect because when coordinating two
longer main clauses such as these, it’s conventional to use a comma before the
coordinating conjunction.

Choice A is the best answer. The convention being tested is subject-modifier
placement. This choice makes the noun phrase “topological tapestries” the
subject of the sentence and places it immediately after the modifying phrase
“woven…grandmother.” In doing so, this choice clearly establishes that the
topological tapestries—and not another noun in the sentence—are being
described as woven from recycled yarn and hand tufted.

Choice B is incorrect because it results in a dangling modifier. The placement of the noun phrase “Argentine textile artist Alexandra Kehayoglou” immediately after the modifying phrase illogically suggests that Kehayoglou is woven from recycled yarn and hand tufted. Choice C is incorrect because it results in a dangling modifier. The placement of the pronoun “she” and the noun phrase “Argentine textile artist Alexandra Kehayoglou” after the modifying phrase illogically suggests that Kehayoglou is woven from recycled yarn and hand tufted. Choice D
is incorrect because it results in a dangling modifier. The placement of the noun “Alexandra Kehayoglou” immediately after the modifying phrase illogically suggests that Kehayoglou is woven from recycled yarn and hand tufted.

Choice C is the best answer. The convention being tested is end-of-sentence
punctuation. This choice correctly uses a question mark to punctuate the
coordinated interrogative clauses “What are atmospheric rivers” and “how do they
affect our weather,” both of which ask direct questions.

Choice A is incorrect because a period can’t be used in this way to punctuate an
interrogative clause, such as “how do they affect our weather,” at the end of a
sentence. Choice B is incorrect because the structure requires an interrogative
clause and a question mark at the end of the sentence. Choice D is incorrect
because the structure requires an interrogative clause at the end of the sentence.

Choice A is incorrect because the plural verb “are” doesn’t agree in number with
the singular subject “the triangle.” Choice B is incorrect because the plural verb
“have been” doesn’t agree in number with the singular subject “the triangle.”
Choice C is incorrect because the plural verb “were” doesn’t agree in number with
the singular subject “the triangle.”Choice D is the best answer. The convention being tested is subject-verb agreement.
The singular verb “is” agrees in number with the singular subject “the triangle.”