Directions: Read the sentence to find out whether there is any grammatical error or idiomatic 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 band have been (1)/ performing at many cause-oriented concerts (2) / to encourage people to come forward and (3)/ lend. their support to the noble cause. (4)/ No error (5).