Each question in this section has a sentence with three underlined parts labelled (a), (b) and (c). Read each sentence to find out whether there is any error in any underlined part and indicate your answer in the Answer Sheet against the corresponding letter i.e., (a) or (b) or (c). If you find no error, your answer should be indicated as (d).

(a) After a successful tour of Europe, / (b) my old parents returned back to India / (c) on New Year's day.