A part of the sentence may or may not have an error. Find out which part has an error and mark that part as your answer. If there are no errors, mark 'No error' as your answer.
An elderly man who had been mopping around the counter looked up from his tedious chore and smiled at whomever had walked in.
1
smiled at whomever had walked in.
2
mopping around the counter looked
3
up from his tedious chore and
4
An elderly man who had been