Knowledge of Language

330 questions

Question 1Question

Read the following passage about art history. Which word most precisely and clearly completes the sentence while maintaining a formal, academic tone?

Fill in the blanks below

For centuries, the authorship of the portrait was a subject of intense debate among art historians. Recently, however, researchers used advanced X-ray fluorescence to analyze the paint layers, which the mystery by revealing a hidden signature beneath the top varnish. The discovery confirmed that the painting was indeed a masterpiece from Rembrandt's studio.
Show answer & explanation

Answer

resolved (or solved)
The verb 'resolved' (or 'solved') is the most precise and idiomatic word to describe bringing a mystery to a conclusion, especially within a formal, academic context.

Step-by-Step Solution

1
Analyze the context of the sentence and the tone of the passage.
The passage describes an academic investigation that ended a long-standing debate using scientific evidence, establishing a formal tone.
Determining the context and register helps eliminate words that are too informal or imprecise.
2
Identify the relationship between the blank and the noun 'mystery'.
The blank requires a verb that collocates precisely with 'mystery' in a formal context.
Choosing a word that is idiomatic and precise is essential for maintaining the clarity and tone of the passage.
3
Select the correct verb that best fits the context.
Verbs like 'resolved', 'solved', 'settled', or 'unraveled' are the most precise and idiomatic terms for bringing a mystery to a definitive end.
These verbs accurately convey that the mystery was concluded through empirical evidence, matching the academic style.

Key Concept

Selecting precise vocabulary that fits the context and register of the passage.
Question 2Question

Read the passage about home construction. Fill in the blank with the most precise and clear adjective that describes a firm, balanced, and unmoving structure.

Fill in the blanks below

To build a strong foundation for the house, the construction crew poured concrete into the wooden frames. The workers made sure the mixture was perfectly level before it hardened. This careful process ensured that the structure would remain and safe for many years.
Show answer & explanation

Answer

stable (or similar precise adjectives denoting structural integrity such as solid, secure, steady, or strong)
The correct answer must be a precise adjective describing structural integrity. The word 'stable' (along with synonyms like 'solid', 'steady', or 'secure') fits the formal register of the passage and clearly conveys that the foundation is firm, balanced, and safe.

Step-by-Step Solution

1
Analyze the context of the sentence containing the blank.
The passage describes building a foundation using concrete that is poured and leveled carefully.
This establishes the physical context of building stability and structural soundness.
2
Determine the required meaning and tone.
The word must describe a physical structure that is firm, balanced, and unlikely to collapse, maintaining a formal and objective tone.
Standardized tests require word choices that match both the meaning and the formal register of the passage.
3
Identify precise words that fit this context.
Adjectives like 'stable' or 'solid' precisely describe the physical integrity of a foundation, while vague words like 'good' or informal words like 'stuck' are inappropriate.
Choosing a precise adjective provides the necessary clarity and academic tone.

Key Concept

Word Precision and Clarity
Question 3Question

Read the passage below and select the choice that best replaces the underlined portion to eliminate redundancy.

"The astronaut looked out the window and saw the Earth, which was a round sphere floating in the dark void of space."

Which of the following options best eliminates the redundant phrasing while maintaining correct grammar?

Show answer & explanation

Answer: a sphere

Answer

a sphere
The correct choice is the most concise option because a sphere is already a round object, making the modifier 'round' redundant. The phrasing 'a sphere' functions cleanly as an appositive modifying 'Earth' without introducing any grammatical errors.

Step-by-Step Solution

1
Identify the redundancy in the underlined phrase.
The phrase 'round sphere' is redundant because a sphere is, by definition, a round three-dimensional shape.
Eliminating redundant words is necessary to make the sentence concise and direct.
2
Evaluate the remaining options for grammatical correctness and conciseness.
The option containing just 'a sphere' is the most concise and forms a grammatically correct appositive phrase. The options that introduce a comma splice or a dependent clause fragment are grammatically incorrect.
ACT English questions require the correct choice to be both grammatically correct and free of redundancy.

Key Concept

Eliminating Redundancy
Estimated Time:45s
Question 4Question

To prepare for the long hike, Sarah packed plenty of water, some snacks, and a first-aid kit in her backpack, which was a pack she carried on her back.

Which of the following options, if substituted for the underlined portion, makes the sentence most concise and grammatically correct?

Show answer & explanation

Answer: DELETE the underlined portion

Answer

Delete the underlined portion to remove the redundant description of the word 'backpack'.
The correct choice is to delete the underlined portion. The sentence already mentions a 'backpack,' which by definition is a pack carried on one's back. Adding a clause explaining this meaning is redundant. Deleting the underlined portion eliminates this redundancy, making the sentence clear and concise while maintaining grammatical correctness.

Step-by-Step Solution

1
Analyze the underlined portion in context of the sentence.
The sentence states that Sarah packed items 'in her backpack, which was a pack she carried on her back.'
To identify if there is any wordiness, redundancy, or grammatical errors in the original phrasing.
2
Identify the redundancy in the sentence.
A 'backpack' is defined as a pack carried on the back, making the phrase 'which was a pack she carried on her back' redundant.
Redundant descriptions should be eliminated to make the writing concise and standard for the ACT exam.
3
Evaluate the choices to find the most concise and grammatically correct option.
Deleting the underlined portion completely removes the redundancy without creating a grammatical error, leaving the clean sentence: 'To prepare for the long hike, Sarah packed plenty of water, some snacks, and a first-aid kit in her backpack.'
The correct ACT English choice for wordiness/redundancy is the most concise option that preserves meaning and grammar.

Key Concept

Eliminating redundant descriptions and wordy phrasing to ensure sentence conciseness.
Question 5Question

Every year, the migration of monarch butterflies attracts thousands of tourists who travel annually to witness the event.

Which of the following is the best replacement for the underlined portion of the sentence?

Show answer & explanation

Answer: attracts thousands of tourists

Answer

attracts thousands of tourists
The correct answer is the option that deletes 'who travel annually' and only keeps 'attracts thousands of tourists'. This choice is the most concise because the sentence already begins with the phrase 'Every year,' which makes 'annually' redundant. It is also grammatically correct and preserves the author's intended meaning.

Step-by-Step Solution

1
Identify any redundant or repetitive phrasing in the sentence.
The sentence begins with the phrase 'Every year,' which means that the entire sentence is contextually set to occur on a yearly basis. The underlined portion contains 'who travel annually,' where 'annually' means the same thing as 'every year,' resulting in redundant repetition.
To maintain a clear and concise writing style, synonyms that repeat information already established in the sentence must be eliminated.
2
Evaluate the choices for both conciseness and grammatical correctness.
The option that simply states 'attracts thousands of tourists' removes the redundant reference to yearly travel without changing the sentence's meaning. The other options either keep the redundant word 'annually' or introduce structural grammatical errors such as a sentence fragment or a comma splice.
The correct answer on the ACT English section must be the most concise option that preserves the sentence's meaning and remains grammatically correct.

Key Concept

Eliminating redundancy requires removing unnecessary words or phrases that repeat information already expressed elsewhere in the sentence.
Question 6Question

During her trip to the local botanical garden, Sarah spent several hours observing the orchids, which she noted were currently blooming at this present time.

Which choice most effectively minimizes redundancy in the underlined portion of the sentence?

Show answer & explanation

Answer: blooming

Answer

The correct answer is 'blooming', as it is the most concise choice that avoids redundancy and maintains grammatical correctness.
The option containing only 'blooming' is correct because it is the most concise choice and avoids redundant language while keeping the sentence grammatically sound.

Step-by-Step Solution

1
Identify repetitive or redundant words in the original sentence.
The words 'currently' and 'at this present time' express the exact same concept of happening in the present moment.
Redundant synonyms must be removed to ensure clear and concise writing.
2
Evaluate the remaining options for both conciseness and grammatical correctness.
The single word 'blooming' eliminates the repetition while fitting the grammatical structure of the sentence. The other options either maintain the redundancy, introduce a comma splice, or create a sentence fragment.
The correct choice must improve conciseness without introducing new grammatical errors.

Key Concept

Eliminating Redundancy
Estimated Time:45s
Question 7Question

Deep in the Mariana Trench, the Mariana snailfish thrives under extreme pressure that would easily crush most other marine organisms, due to the fact that it has bones that are flexible and cartilage-like.

Which of the following is the most concise and grammatically correct replacement for the underlined portion?

Show answer & explanation

Answer: organisms because it has

Answer

organisms because it has
The correct option is the most concise and direct phrasing that maintains the meaning of the sentence without introducing any grammatical or punctuation errors.

Step-by-Step Solution

1
Identify the wordiness in the original sentence.
The phrase 'due to the fact that it has' is wordy and can be simplified to a direct conjunction.
ACT English style requires avoiding excessive words when a simpler, more direct phrasing is available.
2
Check the remaining choices for grammatical correctness.
The option that removes the conjunction entirely creates a comma splice, and the option with extra commas violates correct punctuation rules by separating the verb from its direct object.
Eliminating wordiness must not introduce new grammatical errors.

Key Concept

Eliminating Wordiness
Question 8Question

Although the scientists wanted to present their findings at the annual conference, they had to postpone the scheduled presentation until a later date due to incomplete data.

Which choice best replaces the underlined portion of the sentence?

Show answer & explanation

Answer: postpone the presentation

Answer

postpone the presentation
The correct answer is the option that removes both the redundant phrase 'until a later date' (since 'postpone' already implies a delay to a later time) and the wordy adjective 'scheduled,' resulting in a grammatically correct and concise sentence.

Step-by-Step Solution

1
Identify the redundancy in the underlined phrase.
The word 'postpone' already indicates that the action is rescheduled for a future time, which makes the phrase 'until a later date' repetitive.
Redundancy is tested on the ACT by checking if the same idea is repeated unnecessarily using different words.
2
Evaluate the choices for both conciseness and grammatical correctness.
The option that simply states 'postpone the presentation' is the most concise choice and avoids grammatical errors such as comma splices or fragment constructions.
The correct answer must improve clarity and economy of language while adhering to rules of standard written English.

Key Concept

Eliminating Redundancy
Estimated Time:40s
Question 9Question

During the excavation, the team uncovered a collection of clay tablets. Currently, these ancient artifacts are now stored in the university archives.

Which of the following is the best replacement for the underlined portion of the sentence?

Show answer & explanation

Answer: These ancient artifacts are now stored

Answer

The option that reads 'These ancient artifacts are now stored' is the correct answer.
The correct choice is the option that states 'These ancient artifacts are now stored.' This version successfully removes the redundant word 'Currently' while preserving a complete, grammatically sound sentence.

Step-by-Step Solution

1
Identify any redundant phrasing in the underlined segment.
The words 'Currently' and 'now' both indicate the present time. Using both in the same sentence is redundant.
ACT style guides require eliminating unnecessary repetition to maintain concise writing.
2
Evaluate the remaining options for correctness, conciseness, and sentence structure.
The option beginning with 'These ancient artifacts' removes the redundancy. The option beginning with 'Being that' creates a fragment, and the option with two independent clauses creates a comma splice.
The correct choice must not only remove redundancy but also maintain grammatical correctness.

Key Concept

Eliminating Redundancy
Question 10Question

Many archival institutions prioritize the preservation of ancient manuscripts. Because these historic documents are fragile and prone to deterioration, the preservationists handled the folios with extreme care, mindful of the delicate, easily damaged nature of the pages, which could easily break.

Which of the following choices best replaces the underlined portion of the passage?

Show answer & explanation

Answer: extreme care, mindful of the pages' delicate nature.

Answer

The correct choice is the option that states 'extreme care, mindful of the pages' delicate nature.'
The correct option is the most concise choice that successfully eliminates the redundant synonyms ('delicate', 'easily damaged', 'could easily break') while keeping the sentence grammatically sound.

Step-by-Step Solution

1
Analyze the underlined portion for wordiness and repetitive meaning.
The phrases 'delicate', 'easily damaged', and 'could easily break' all repeat the same basic meaning already established by the word 'fragile' earlier in the sentence.
ACT English requires the elimination of wordy and redundant phrases.
2
Evaluate the choices to find the one that is grammatically correct and most concise.
The option ending in 'delicate nature' is the shortest grammatically correct option. The choice with 'they were mindful' creates a comma splice, and the choice that splits the sentence with a period before 'Mindful' creates a fragment.
The correct choice must resolve both the redundancy and any grammatical errors introduced by the distractors.

Key Concept

Eliminating Redundancy
Estimated Time:1m 0s
Question 11Question

Modern conservationists use multi-spectral imaging to analyze ancient manuscripts, revealing text that has, over a long duration of time, become faded and worn down so that it cannot be seen.

Given the context of the sentence, which choice is the most concise and grammatically correct option for the underlined portion?

Show answer & explanation

Answer: invisible to the naked eye

Answer

invisible to the naked eye
The choice 'invisible to the naked eye' is the most concise option that conveys the intended meaning of the sentence. It removes all redundant phrases and wordiness without introducing grammatical errors.

Step-by-Step Solution

1
Identify the wordy and redundant parts of the underlined segment.
The original phrasing contains redundant concepts, such as 'long duration of time' and 'faded and worn down so that it cannot be seen'.
ACT English rewards concise and direct phrasing that avoids repeating the same ideas.
2
Compare the remaining choices for grammatical correctness and conciseness.
The phrasing 'invisible to the naked eye' conveys the entire meaning in six words without any grammatical errors or unnecessary complexity.
The correct choice must preserve the sentence's meaning while being the shortest grammatically correct option.

Key Concept

Eliminating Wordiness
Estimated Time:1m 0s
Question 12Question

The museum curator carefully restored the ancient vase. She worked in a manner that was slow and cautious to avoid damaging the fragile clay.

Which choice is the most concise and grammatically correct replacement for the underlined portion?

Show answer & explanation

Answer: She worked slowly and cautiously

Answer

She worked slowly and cautiously
The option stating 'She worked slowly and cautiously' is correct because it replaces the wordy prepositional phrase with direct adverbs, making the sentence concise and grammatically correct.

Step-by-Step Solution

1
Identify the wordiness in the underlined segment.
The phrase 'in a manner that was slow and cautious' contains unnecessary words to describe how the curator worked.
ACT English questions prioritize clear and concise writing.
2
Evaluate the choices to find the one that is both concise and grammatically correct.
The option using simple adverbs is correct, while the others either retain the wordiness, create a fragment, or result in a comma splice.
The correct answer must be the most concise option that is free of grammatical errors.

Key Concept

Eliminating Wordiness
Question 13Question

During nocturnal hikes in the damp forests of southern Brazil, travelers often witness a glowing green light emanating from the forest floor. This eerie glow is produced by *Neonothopanus gardneri*, a species of bioluminescent mushroom. The reason why these mushrooms glow in the dark is due to the fact that they contain a chemical compound called luciferin, which reacts with oxygen to attract spore-spreading insects.

Which choice is the most concise and grammatically correct version of the underlined portion?

Show answer & explanation

Answer: These mushrooms glow because they contain

Answer

These mushrooms glow because they contain
The correct option, 'These mushrooms glow because they contain,' is the most direct and concise way to state the cause of the glowing. It avoids the wordiness and redundancies of the original sentence while maintaining proper grammatical structure.

Step-by-Step Solution

1
Identify wordy or redundant expressions in the underlined segment.
The original text contains 'The reason why', 'is due to', and 'the fact that', which are all different ways of stating the same causal relationship.
Recognizing redundancy allows you to eliminate extra words that do not add unique meaning to the sentence.
2
Evaluate the alternatives for grammatical correctness and conciseness.
The option stating 'These mushrooms glow because they contain' uses a single conjunction ('because') to establish the cause clearly and maintains a complete independent clause.
The correct answer must be both grammatically sound and free of wordiness.

Key Concept

Eliminating Wordiness
Question 14Question

Originally built as a fortress in the late twelfth century, the Louvre Palace underwent numerous renovations. It was transformed into a museum, and this was done for the purpose of showing art to the public in 1793.

Which of the following is the best replacement for the underlined portion?

Show answer & explanation

Answer: It became a public art museum

Answer

It became a public art museum
The correct option is the most concise and direct phrasing. It eliminates the passive structure and the redundant explanation of a museum's purpose, replacing it with a straightforward active statement.

Step-by-Step Solution

1
Identify wordiness, redundancy, or passive structures in the underlined portion.
The phrase 'It was transformed into a museum, and this was done for the purpose of showing art to the public' is identified as wordy and passive.
Standard English conventions require eliminating unnecessary words to make sentences clear and direct.
2
Evaluate the choices to find the most concise and grammatically correct option.
The option stating 'It became a public art museum' is the most concise and contains no grammatical errors, whereas the other options introduce punctuation mistakes or sentence fragments.
The correct choice must improve conciseness without introducing new grammatical errors.

Key Concept

Eliminating Wordiness
Estimated Time:45s
Question 15Question

Geothermal geysers, such as Yellowstone's Old Faithful, erupt on highly predictable schedules due to the buildup of underground pressure. The geothermal water, which is heated to a high temperature by hot magma beneath the Earth's surface, boils and eventually forces its way upward.

Which of the following options represents the most effective and grammatically correct replacement for the underlined portion?

Show answer & explanation

Answer: heated by magma beneath the Earth's surface, boils and

Answer

heated by magma beneath the Earth's surface, boils and
The correct option is the most concise and grammatically sound choice. The phrase 'heated by magma' communicates the temperature changes clearly without the wordy addition of 'which is heated to a high temperature' and the redundant adjective 'hot' before 'magma,' since magma is inherently hot. It maintains the proper sentence structure by providing the active verbs 'boils' and 'forces' for the subject 'geothermal water.'

Step-by-Step Solution

1
Identify the redundancy in the underlined portion.
The phrase 'heated to a high temperature' and the adjective 'hot' before 'magma' are redundant, as magma is by definition extremely hot.
ACT English requires the most concise version that preserves the meaning.
2
Eliminate options that fail to correct the redundancy or introduce grammatical errors.
Removing the redundant words leaves 'heated by magma beneath the Earth's surface, boils and'. Check this against options containing punctuation errors or run-ons.
Distractors often try to fix one error while introducing a new grammatical issue.
3
Verify sentence structure with the remaining option.
Inserting the concise option creates a grammatically complete sentence where 'heated by magma beneath the Earth's surface' is a modifying phrase, and 'boils and eventually forces' serves as the compound predicate for 'The geothermal water'.
Ensures the choice maintains complete sentence structure without creating fragments or comma splices.

Key Concept

Eliminating Redundancy
Question 16Question

To transport clean water across long distances, Roman engineers constructed aqueducts, which were vast bridge-like structures that carried water over valleys. Because they relied on gravity alone as the sole force of movement, the conduits had to decline at a precise, consistent slope to prevent stagnation.

Which of the following choices best replaces the underlined portion of the sentence to construct a clear, grammatically correct statement without redundant phrasing?

Show answer & explanation

Answer: Because they relied on gravity alone, the

Answer

Because they relied on gravity alone, the
The correct option, 'Because they relied on gravity alone, the', successfully eliminates the redundant phrase 'as the sole force of movement' from the original sentence. Since 'gravity alone' already conveys that gravity was the only source of propulsion, any additional mention of a 'sole force' is repetitive. This option resolves the redundancy while maintaining grammatical correctness and clear sentence structure.

Step-by-Step Solution

1
Identify the redundant information in the underlined portion of the sentence.
Recognize that 'gravity alone' and 'sole force of movement' express the exact same concept of a single driving force.
To make the sentence clear and concise, repetitive ideas must be removed.
2
Evaluate the options to find the one that removes this redundancy without introducing grammatical errors.
The choice 'Because they relied on gravity alone, the' removes 'sole force of movement' while maintaining a subordinate clause that logically connects to the main clause.
This establishes a clear cause-and-effect relationship using the subordinator 'Because'.
3
Check the remaining options for grammatical correctness and sentence structure errors.
The choice starting with 'Relying' creates a dependent fragment, while the choice 'They relied on gravity alone, the' results in a comma splice.
Ensuring the selected choice forms a complete, grammatically correct sentence is necessary to satisfy ACT English conventions.

Key Concept

Redundancy in writing occurs when words or phrases repeat the same information. In standardized tests like the ACT, the most concise grammatically correct option that preserves the sentence's meaning is always preferred.
Question 17Question

The paleontologists examined the apex predator's fossilized jaw, it was uniquely adapted for the sole and exclusive purpose of crushing dense bone.

Which of the following choices, if used to replace the underlined portion, most effectively eliminates the redundancy in the sentence?

Show answer & explanation

Answer: which was uniquely adapted for

Answer

The correct choice is the option that uses 'which was uniquely adapted for' to create a subordinate clause and eliminate redundant wording.
The correct option resolves the comma splice by using the relative pronoun 'which' to subordinate the second clause, and it removes the redundant synonyms 'sole' and 'exclusive' to make the sentence concise.

Step-by-Step Solution

1
Identify any grammatical errors in the original sentence.
The clause starting with 'it was' creates a comma splice when joined to the first independent clause with only a comma.
Before looking at style, ensure the grammar is correct.
2
Identify redundant phrasing in the underlined portion.
The terms 'sole' and 'exclusive' are synonymous, and 'purpose of crushing' is wordier than necessary.
Redundancy weakens style and should be eliminated.
3
Evaluate the options to find one that resolves both the comma splice and the redundancy.
The option using 'which was uniquely adapted for' resolves the comma splice and eliminates the redundancy.
This option is both grammatically correct and concise.

Key Concept

Eliminating Redundancy
Estimated Time:1m 0s
Question 18Question

In the mid-nineteenth century, Samuel Morse developed the telegraph, which revolutionized long-distance communication. Before this invention, messages took days or even weeks to travel across the country by horse. With the introduction of the telegraph, which was a device that allowed for messages to be sent rapidly, communication became nearly instantaneous. This breakthrough transformed commerce, journalism, and personal correspondence.

Which of the following is the most effective replacement for the underlined segment?

Show answer & explanation

Answer: With the telegraph,

Answer

The correct answer is the concise phrase that simply states 'With the telegraph,'.
The correct option, which states 'With the telegraph,', is the most concise and direct choice. It avoids describing what the telegraph is (since the context has already defined it as a communication invention) and establishes a clear, grammatically correct transition into the main clause.

Step-by-Step Solution

1
Identify redundant details and unnecessary wordiness within the underlined segment.
The phrase explaining that the telegraph was a device for rapid communication is redundant because the preceding context already established it as a revolutionary long-distance communication invention.
Eliminating wordiness requires removing details that the reader can already infer from the context.
2
Evaluate the remaining choices for grammatical correctness and conciseness.
The option stating 'With the telegraph,' preserves the original meaning in the fewest words, whereas the other options introduce comma splices, passive phrasing, or synonym redundancy.
The most effective choice must be both grammatically sound and as brief as possible.

Key Concept

Eliminating Wordiness
Estimated Time:45s
Question 19Question

Engineers studying ancient Roman architecture have long marveled at the durability of its concrete, which has survived for millennia. Recent chemical analyses reveal that the secret lies in 'lime clasts'—small, white mineral chunks that were once considered mere mixing defects. These tiny, white chunks of lime, which are small in size, actually allow the concrete to self-heal cracks when exposed to rainwater.

Which choice most concisely and clearly expresses the underlined portion?

Show answer & explanation

Answer: these lime clasts actually allow

Answer

The correct option is the phrasing 'these lime clasts actually allow'.
The correct phrasing uses the term 'these lime clasts actually allow'. It refers back to the previously introduced 'lime clasts' concisely and uses the active verb 'allow' to form a complete, grammatically correct sentence without redundant synonyms.

Step-by-Step Solution

1
Identify the wordy and redundant elements in the underlined portion.
The underlined text contains redundant descriptors ('tiny' and 'small in size' are synonymous) and repeats descriptive information ('white chunks of lime') that the preceding sentence has already defined.
ACT style requires the elimination of redundant words and repetitive details to maximize conciseness.
2
Examine the remaining choices for grammatical correctness.
The option containing 'allowing' turns the main clause into a fragment by omitting a finite verb. The option 'it is these lime clasts that actually allow' is grammatically correct but introduces a wordy cleft construction.
Correct options must be grammatically complete and avoid unnecessary stylistic complexity.
3
Identify the option that is both grammatically correct and the most concise.
The option 'these lime clasts actually allow' uses the previously defined term concisely and retains the active verb 'allow'.
Conciseness is the primary goal once grammatical correctness and original meaning are secured.

Key Concept

Eliminating wordiness and redundancy in sentence structure.
Estimated Time:1m 0s
Question 20Question

Ancient Greek architects constructed theaters with a semicircular design; this intentional shape, which was planned on purpose, allowed sound waves to travel efficiently to the top rows.

Which choice most effectively eliminates the redundancy in the underlined portion of the sentence while maintaining correct grammar and punctuation?

Show answer & explanation

Answer: design; this intentional shape allowed

Answer

The choice that reads 'design; this intentional shape allowed' is the correct answer.
The correct answer removes the redundancy by eliminating the phrase 'which was planned on purpose,' as 'intentional' already expresses this idea. It also correctly uses a semicolon to separate the two independent clauses.

Step-by-Step Solution

1
Identify any redundant expressions in the underlined portion.
The words 'intentional' and 'planned on purpose' express the same concept.
Conciseness is a key grammatical standard on the ACT; expressing the same concept twice is redundant.
2
Evaluate the sentence structure of the remaining choices.
The sentence consists of two independent clauses: one about the architects constructing theaters and one about the shape allowing sound waves to travel.
Two independent clauses must be joined by a semicolon or separated by a period, not a comma.
3
Select the option that corrects both issues.
Using a semicolon and removing the redundant phrase makes the sentence both grammatically correct and concise.
This resolves the redundancy while avoiding errors like comma splices or fragments.

Key Concept

Eliminating redundant words or phrases to ensure conciseness while maintaining proper sentence boundaries (avoiding fragments and comma splices).
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