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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. Collecting money for the new school

B. may not be very easy

C. but if everyone does their best

D. we can still reach the target

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