Read the sentence given below to find out if it contains any error. The error, if any, will be only in one part of the sentence. If the sentence is error-free, select No Error or Option 5(E). Ignore errors of punctuation, if any.

Hours after hours (A)/ passed away but Avi never (B)/ showed up and we were unsure (C)/ whether to be angry or worried. (D)/ No error (E)