Directions: In the following sentence, some parts have been underlined and labelled as (A), (B) and (C). Identify the underlined part that contains an error. If there is no error in any part, mark your answer as (D).

(A) It was she (B) who we expected (C) to score the highest marks in the exam. (D) No error.

The subject here is 'we'. Put in the assertive form, the sentence would read: 'we expected 'her' to'. Hence, the correct usage is objective 'whom'' in place of subjective 'who'. The best way to check up the applicability of who or whom is to get the answer for the question involved. For example: Who are you? The answer is I am X. Whom do you want to see? The answer is I want to see him. In the first case, who stands for the subject I, in the second case it stands for the object him.