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Difficulty: Very hardSubject-Modifier Agreement

In the mid-twentieth century, ecologists generally assumed that kelp forests were stable ecosystems that could withstand significant environmental fluctuations. However, recent studies on marine trophic cascades have challenged this view. Observing the rapid collapse of kelp canopies following the local extinction of sea otters, __________

Which choice completes the text so that it conforms to the conventions of Standard English?

  1. marine biologists realized that top-down predatory control is crucial for maintaining coastal biodiversity.Answer
  2. B
    remote sensing technology allowed marine biologists to realize that top-down predatory control is crucial for maintaining coastal biodiversity.
  3. C
    the crucial role of top-down predatory control in maintaining coastal biodiversity was realized by marine biologists.
  4. D
    marine biology's understanding of coastal biodiversity was transformed, revealing that top-down predatory control is crucial.

Answer

marine biologists realized that top-down predatory control is crucial for maintaining coastal biodiversity.
The introductory modifying phrase 'Observing the rapid collapse of kelp canopies following the local extinction of sea otters' describes an action that must be logically performed by the subject of the main clause. The group performing the action of observing is the marine biologists. Therefore, the main clause must begin with the noun phrase 'marine biologists' as its subject. The option beginning with 'marine biologists' correctly establishes this relationship, making the sentence grammatically sound.

Step-by-Step Solution

1
Identify the introductory modifying phrase and determine the entity that logically performs the action described.
The action of 'observing' must be performed by a conscious observer, which in this context is 'marine biologists'.
An introductory participial phrase must modify the subject of the clause that immediately follows it.
2
Evaluate the subject of each option to find the one that begins with the logical subject.
Only the option starting with 'marine biologists' provides the correct logical subject immediately following the modifier.
Placing any other noun or phrase immediately after the modifier creates a dangling or misplaced modifier error.

Key Concept

Subject-Modifier Agreement
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Topics

Subject-Modifier Agreement

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