In the following sentences, four words or phrases have been printed in bold. One bold part in the sentence is not acceptable in Standard English. Pick up that part and mark its number. If there is no error in the bold part, mark (5) i.e. ‘No error’ as the answer.

A thoroughly reading (1)/  of the prescribed text (2)/ will always help you to write better answers (3)/ which in turn will help you to score better (4)/ No error (5).