Which sentence keeps correct parallel structure in a correlative construction?

Answer and explanation

Correct answer: B. The new policy requires students not only to submit a proposal but also to defend it before a panel.

  1. Step 1: 'Not only ... but also' must join two grammatically identical elements.
  2. Step 2: Here both elements are infinitives (to submit / to defend), which gives a balanced structure.
Answer
The new policy requires students not only to submit a proposal but also to defend it before a panel.
Why not the others: The others pair an infinitive with an -ing form or with a full clause, so the two halves are not parallel.

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