Which sentence demonstrates proper grammatical parallelism in a series of infinitive phrases?

Answer and explanation

Correct answer: B. The engineer sought to evaluate water pressure, test valves, and calibrate the flow meters

  1. Step 1: When listing actions controlled by the infinitive marker 'to', all elements must be parallel base verbs (evaluate, test, calibrate).
Answer
The engineer sought to evaluate water pressure, test valves, and calibrate the flow meters.
Why not the others: The remaining options mix gerunds (-ing), nouns (test, evaluation), and infinitives.

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