Which sentence best uses a character's speech to show that she is arrogant?

A. "I don't see how I could help you with this, but I am of course
happy to try in whatever way I can."
O
B. "Well, I question whether anyone can help stop this from
happening. It is a systemic problem in our society."
O
C. "I'm sure I can help. I've always been able to use my keen wit and
formidable intelligence to solve these kinds of seemingly
unsolvable problems."
O
D. "Yes, I am a Harvard graduate. Why do you ask?"