Read the following passive sentence:
The drain was fixed by the plumber who was called when the sink had clogged. Which revision below is an active sentence? A. When the sink clogged, a plumber was called to fix the drain.
B. The plumber fixed the drain in the clogged sink.
C. The plumber called to fix the clogged sink drain was able to clear it.
D. The sink drain that clogged was fixed by the called plumber.