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).

We don't can use our phones(A)/ in the examination hall.(B)/If you get caught it will (C)/be considered as a copy case(D)/ No error(E)