Which sentence maintains proper grammatical parallelism across listed elements?
Answer and explanation
Correct answer: B. The laboratory intern was responsible for calibrating the equipment, recording test results, and cleaning the glassware.
- Step 1: Parallel structure requires that all items in a series share the same grammatical form.
- Step 2: Here, all three elements use parallel gerund phrases: 'calibrating...', 'recording...', and 'cleaning...'.
Answer
The laboratory intern was responsible for calibrating the equipment, recording test results, and cleaning the glassware.
Why not the others: '...calibrating..., recording..., and to clean...' mixes gerunds with an infinitive; '...to calibrate..., recording..., and clean...' mixes infinitives, gerunds, and base verbs; '...calibration, recording..., and to clean' mixes nouns, gerunds, and infinitives.
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