In which sentence are the pronoun and antecedent not in agreement?

a the bear licked its muddy paws.
b gretchen and paula did not know when they would see each other again.
c if the bus is late, he will be late to class.
d anita swam to the surface to catch her breath.

The sentence in which the pronoun and the antecedent are not in agreement is option C. If the bus is late, he will be late to class. In the first clause, the subject of the sentence is the word "bus", and in the next clause, the subject changed to "he" and the pronoun he does not clearly state its antecedent.

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