Question

In the following sentence, four words or phrases have been underlined. Choose the word or phrase which is not appropriate in standard written English. If the sentence has no error, mark (5).

A person like you who pays (1) their (2) bills (3) promptly is (4) the backbone of our business. NO ERROR (5)

Answer 1

Since the reference is to a single person, the plural "their" [2] is incorrect and should be changed to the single pronoun, "his".