Directions: Read the following sentence to find out whether there is any grammatical error in it. Select the part that contains the error as your answer.

The supervisor requested (A)/ that the analyst prepares (B)/ the quarterly financial statement (C)/ prior to the board meeting. (D)/ No error

The correct option is B.

Explanation:
In English grammar, certain verbs expressing a demand, request, recommendation, or requirement (such as requested, suggested, insisted, required) followed by a that-clause require the subjunctive mood in the subordinate clause.

In the subjunctive mood, the verb must be in its base form (bare infinitive) regardless of whether the subject is singular or plural. Therefore, "prepares" in part (B) should be replaced with the base verb form "prepare".

Correct Sentence:
"The supervisor requested that the analyst prepare the quarterly financial statement prior to the board meeting."

Hence, the grammatical error is in part (B).