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In each of these questions, a sentence has been divided into four parts and marked a. b, c and d. One of these parts contains a mistake in grammar Idiom or syntax. Identify that part and mark it as the answer.

A. He hanged his

B. head in shame

C. when he came to know of his

D. sons mischief.

Please do not use chat terms. Example: avoid using "grt" instead of "great".