Asked by GIANSH GUPTA KHUNDKER · BIRLA BRAINIACS
Answer: D. Both A and C are grammatically correct.
Answer: D) Both A and C are grammatically correct.
Explanation: "Who" changes to "By whom" at the beginning of a passive sentence, followed by an inverted question structure (was + subject + V3). Alternatively, you can start with "Who", put the auxiliary verb next, and place the preposition "by" at the very end of the sentence. Both formats are acceptable.
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