Can you beat this one?

Which quotation from The Autobiography of an Ex-Colored Man most effectively illustrates the claim?

1. A"These players often improvised crude and, at times, vulgar words to fit the melodies."
2. B"Several of these improvisations were taken down by white men, the words slightly altered, and published under the names of the arrangers."
3. C"In fact, there is not a corner of the civilized world in which it is not known, and this proves its originality"
4. D"I talked to the piano-player between the musical numbers and found out that he was just a natural musician, never having taken a lesson in his life."