Which sentence has an error in pronoun-antecedent agreement?
A) Although politicians make many promises to their constituents, he often are not able to deliver on those promises.
B) I could tell that Jack was angry beyond anything I'd ever seen before by the way he smashed in my car windshield.
C) All of the actors on stage were shocked at Mrs. Mock's anger at their utter lack of preparation to go "off-book."
D) The problems involved in fixing our attendance system are complex indeed, but they can be solved with some effort.
