GMAT Critical Reasoning (CR) | Very often one hears a person who has become famous

Very often one hears a person who has become famous or successful in their field or endeavor say that they "knew it all along." Although there may be a bit of rosy hindsight in such a claim, the fact remains that self-confidence is an indispensable component of success.

The author of the above passage would most likely agree with which of the statements below?

A. It is not possible to become successful in one's field of endeavor unless one has a certain amount of self-confidence.
B.
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