Identify the sentence that correctly employs correlative conjunctions:

Answer and explanation

Correct answer: D. Not only did the firm finish the project early, but it also stayed in budget.

  1. Step 1: When 'Not only' is placed at the beginning of an independent clause for rhetorical emphasis, subject-auxiliary inversion is required ('Not only did the firm complete...').
  2. Step 2: The second coordinating clause must provide a complete grammatical clause paired with 'but also' or 'but they also'.
  3. Step 3: Option 1 executes both negative inversion and parallel clausal coordination perfectly.
Answer
Not only did the architectural firm complete the stadium design ahead of schedule, but they also remained within the allocated budget.
Why not the others: Sentence 2 omits the subject in the second clause following initial inversion; Sentence 3 lacks required negative inversion ('Not only did...'); Sentence 4 disrupts parallel symmetry by placing subject pronouns unevenly.

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