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In the following 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. We have given up trying to reform him

B. since we found that the more we advised him

C. the least he was inclined

D. even to listen to us

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