sentence contain and error in Pronouns. The answer is d.
A. The invitations for the tomato festival requested that all attendees wear their red shirts.
B. Neither of us could lift the ball, which weighed more than eighty pounds.
C. Almost every medieval Italian painting in the Uffizi has a touch of gold leaf somewhere on its canvas.
D. The swimming instructor admonished the class that if it did not learn how to breathe properly, it would never be a good swimmer.