For which of the following reasons does Mark Twain suggest dying words for Andrew Johnson ("I have been an alderman, Member of Congress, Governor, Senator, Pres-adieu, you know the rest.") and Grant ("0.")?
A. To explain the meaning of other great men's dying words
B. To indicate the potential rewards of being prepared for death
C. To show what good dying words would be
D. To be funny about a serious topic