Answer:
The correct answer to the question: In which sentence are the pronoun and antecedent not in agreement, would be, sentence C: If the bus is late, he will be late to class.
Explanation:
The reason for this answer being the correct one is because of the inconsistency between the information given at the beginning, which mentions a bus, while in the second portion of the sentence, the pronoun being mentioned refers to another subject, a person, a man, instead of replacing the original subject (bus). This shows inconsistency between original subject and pronouns being used as substituted in subsequent sentences. Aside from that, option C is a clear example of a clause, where we have the initial information, and then the addition, or adverbial clause, that extends the information from the initial sentence.