Which sentence in this excerpt from g. k. chesterton's \"the fallacy of success\" contains the central idea of the essay? .
a. they are books showing men how to succeed in everything; they are written by men who cannot even succeed in writing books..
b. but, passing over the bad logic and bad philosophy in the phrase, we may take it, as these writers do, in the ordinary sense of success in obtaining money or worldly position..
c. this is a definite and business-like proposal,