In the following question, one part of the sentence may have an error. Find out which part of the sentence has an error and click the option corresponding to it. If the sentence is free from error, click the 'No error' option.

Maharashtra, one of India's richest states, is a classical case (A)/ of a lack of development which is seen in its unacceptably high (B)/ level of malnutrition among the children in the tribal belts. (C)/ No error (D)