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

At the station (1)near the ticket counter, (2) the girl asked a boy  (3) that what was he at looking ?(4) No error (5)