Correct option is B
Option
(b) contains an error.
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Explanation: The correct sentence structure is “
was not only prompt” instead of
not only was prompt.
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Correct sentence: His reply
was not only prompt but also complete.
Grammatical rule used: Parallel structure with
not only... but also.
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Explanation in Hindi: "Not only... but also" संरचना में वाक्य की समानता बनी रहनी चाहिए।