Which sentence contains a pronoun with an unclear antecedent?

A. Today when my friend dropped me off at home, I waved goodbye to him.

B. My brother asked me if I would like apples or oranges with breakfast.

C. I was playing catch with my two dogs, Peanut and Butter, because he loves to play so much.

D. Tomorrow is the day my friend returns from visiting her family, and I will finally get to see her again.