单项选择题

What is the reason for using quotation in the following example? Booker claims that "the true hero, if he is to succeed, must be fully a man".But we can find many examples when the opposite seems to be true.
A、To support a claim we just made.
B、To present someone else’s idea which we waht to contradict.
C、To draw attention to a particularly elegant phrase or well-expressed idea.
D、To show the importance of an idea.

A.But
B.

C.
D.
E.