PLEASE ANSWER QUICKLY

Which of the following statements about Raphael’s work is true?
a.
Near the end of his life, he produced his best and most famous pieces.
b.
Near the end of his life, he did not produce any work himself, but rather used his name on all his assistants work.
c.
Near the end of his life, he had many assistants to help him, which produced uneven work.
d.
none of the above