PLZ HELP HURRY Which sentence has a pronoun-antecedent error?

A)Everyone who wants to succeed in life needs to manage his or her money.
B)When e-mail goes down, every one of the teachers holds their breath anxiously.
C)Harrison wasn't sure if his work was good enough to pull an A in his biology class.
D)The two men hadn't seen each other since graduation, so they almost didn't recognize each other.