Hello there!
In the war, Gatsby did quite well, earning medals and such. Right after the war, he tried to get home to Daisy, but by some chance was sent to Oxford.
Meanwhile, Daisy grew tired of waiting for him, (maybe thought he wasn't coming home), and married Tom.
hope this helps you!
~DL
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.