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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 cost of food grains have increased

B. so rapidly during the last two years

C. that salaried classes find it difficult

D. to save any part of their income

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