According to the lecture, which of the following statements is true about the predicament of Mark Twain?
选项：

A:Mark Twain lived like "an uncrowned king" for 40 years, but he was not happy
B:For years in his career, Mark Twain was acclaimed as a prolific joker though he was more like an amazingly pessimistic thinker
C:Mark Twain’s talent was rooted in his boyhood and restrained by crude atmosphere of American frontier, but later was blunted by the gentility of the Easter society
D:Mark Twain’s family and friends were in full support of his writing and would give him their approval of whatever he wrote