The passive form of the sentence, "Who did the work?" is -

The answer "By whom was the work done?" is correct because it properly uses the passive voice. In a passive construction, the focus shifts from the doer of the action to the action itself and the recipient. In this case, "work" is what was done, and "by whom" indicates the party that performed the action, making it clear that the sentence is about the work rather than the person doing it. The structure follows the typical format of passive voice: "subject (work) + form of 'to be' (was) + past participle (done) + agent (by whom)." This order is essential in forming a correct passive sentence, which option c achieves successfully.

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