Directions: In the following sentence, one part of the sentence has an error, and the other parts are correct. Find out which part has an error and mark it as your answer. If there is no error, mark ‘No error’ as your answer. Ignore the error of punctuation, if any.

I tried to persuade them that I am like his family. /(A) But they still didn't open their mouth about /(B) why did he call into the principal office. /(C)I guess we have no other choice but wait for his parent to arrive. /(D) No error. /(E)