Passage Summary: If you have two things—fame and ads—your tour will work. Julia is famous and her tour worked, so she must have had ads.

Conclusion: Julia's book tour must have been well publicized.

Reasoning: A tour succeeds if it is well publicized and the author is established; since Julia is established and her tour succeeded, the publicity must have been present.

Analysis: The argument commits a classic formal logic error known as affirming the consequent. It provides a sufficient condition for success (Publicity + Established) and then assumes that because success occurred, all parts of that specific condition must have been met. It ignores the possibility that a tour could be successful for other reasons even without publicity. To match this flaw, look for an answer that treats a sufficient condition as if it were the only way to achieve a result.