Which of the following statements is not true?

A. "Whom" is an object pronoun.

B. "Who" is a subject pronoun.

C. "Whom" can serve as the object of a preposition.

D. "Who" and "whom" are personal pronouns.

"Whom" can serve as the object of a preposition.

True; Ex. With whom did you go to the mall?

"Whom" is an object pronoun.

True; Ex. To whom did you give the book?

"Who" and "whom" are personal pronouns.

False; Who and whom are relative pronouns. Personal pronouns are: I, you, he, she, him, her, it, we, they, us, them.

"Who" is a subject pronoun.

True; Ex. Who is running?