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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. The advertisement for the new detergent

B. claimed that it was as effective

C. if not more than

D. washing soap in removing dirt from clothes

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