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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. Fluosol is a transparency liquid

B. that very much resembles water

C. but in fact is twice

D. as dense as water

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