How does the sentence "If you want to succeed at whist, either be a good whist-player, or play with marked cards," help develop the writer's claim?
A) It echoes the overall claim of the passage, helping to discount the need for books about success.
B) It serves a contrast to the real message about success, that it comes to those with great virtue.
C) It helps develop the idea that to gain success is to read lots of books by writers who truly understand success.
D) None of these choices explain how the sentence helps develop the writer's claim, as the overall claim is unclear throughout the passage.