Which Example Best Demonstrates a Legislator Acting as a Delegate

Which example best demonstrates a legislator acting as a delegate of his or her constituency?

A) considering public opinion,then using his or her own best judgment about what is good for the nation as a whole
B) doing whatever is best for reelection
C) following the public opinion of the constituency,regardless of his or her personal viewpoint
D) heeding public opinion in every case,except in matters of personal conscience