Which of the following is true anout Mark Twain?
选项：

A:His life on the Colorado River inspired the Adventures of Tom Sawyer and later Huckleberry Finn.
B:Because of Mark Twain and his great works, the Mississippi river has multiple different meanings, including independence, escape, freedom, and romance.
C:He adopted his pen name from a term used on board.
D:He was once called "the father of American literature".