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Difficulty: MediumEliminating Redundancy

Marine biologists tracking harbor porpoises in the Baltic Sea use specialized hydrophones to capture high-frequency clicks. These acoustic signals, which are audible sounds that can be heard, allow the animals to navigate murky waters and locate prey with remarkable precision.

Which of the following choices produces the most concise sentence that avoids redundancy?

  1. A
    These acoustic signals, which are audible sounds that can be heard,
  2. These acoustic signalsAnswer
  3. C
    Although these acoustic signals,
  4. D
    These acoustic signals, and they

Answer

The correct option is 'These acoustic signals' because it conveys the necessary information concisely without repeating synonyms.
The choice 'These acoustic signals' is correct because 'acoustic' already means relating to sound. Adding 'which are audible sounds that can be heard' repeats the concept of sound three separate times. Removing the redundant clause leaves a grammatically complete sentence with maximum clarity and brevity.

Step-by-Step Solution

1
Identify redundant words or phrases in the original sentence.
The original underlined phrase contains 'acoustic signals', 'audible sounds', and 'that can be heard'. All three expressions describe sound that is heard.
ACT English rewards conciseness and penalizes repetitive or tautological phrasing.
2
Test each option to find the shortest version that preserves grammatical correctness and full meaning.
'These acoustic signals' serves as a clear subject for the verb 'allow' without any extra unnecessary words.
Eliminating the parenthetical synonym descriptive clause yields a clean, direct sentence.

Key Concept

Eliminating Redundancy
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Topics

Eliminating Redundancy

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