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.

I was so disturbed by the dispute (1)/ going on between my brother and I (2)/ that I finally decided to go and talk (3)/ to him directly once and for all.(4)/ No error (5)