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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. Pollution effects more people

B. today than it ever did in the past

C. because more people live near industrial units

D. and inhale noxious gases from the atmosphere

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