Read the sentence below to find out if there is any error in it. The error, if any, will be in one part of the sentence. The letter of that part is the answer. If there is no error the answer is (5). (Ignore errors in punctuation if any).

It’s pertinent to note that the amount(A)/ of riot cases came down (B)/significantly this year as communal riots(C)/ broke out in northeast Delhi in February last year.(D)/ No error(E)