I choose B, why A?

@ca_teran1@yahoo.com Happy to help! (A) states that the argument "mistakes the claim that something is required for a purpose for the claim that it is sufficient for that purpose." In this case, that "something" is "a lot of luck." The argument claims the book's statement that luck plays a role is ridiculous because successful people put in a lot of hard work. Therefore, it wrongly interprets the book's argument as claiming that luck is the only thing required for success (AKA sufficient) and fails to take into account that both luck and hard work may be required for success (AKA necessary). (B) is incorrect because the argument does not necessarily accept or comment on the book's view as authoritative. It merely presents a popular book's view and criticizes it. In this case the source is not overly relevant to the reasoning of the criticisms presented. Does that help? Let us know if you have any additional questions!

the word "required" threw me off, can you explain it more

Hi, in this case the word required is referring to a necessary premise.

Sorry, necessary condition