Read the sentence to find out whether there is any 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.

The glasses which she was (1)/ carrying at the tray looked (2)/ delicate but did not break when (3)/ they dropped on the floor.(4)/ No error (5)