Passage Summary: Big stars make movies hits. So, if you don't have big stars, your movie will probably flop.

Conclusion: Movies featuring unknown actors are unlikely to be successful at the box office.

Reasoning: Movies with famous actors often succeed because those actors have established, loyal fan bases.

Analysis: This argument commits a classic formal logic error known as 'denying the antecedent.' It assumes that because a certain factor (famous actors) guarantees success, the absence of that factor guarantees failure. In abstract terms: 'If A, then B; therefore, if Not A, then Not B.' To find a parallel flaw, look for an answer choice that identifies a sufficient condition for an outcome and then incorrectly claims that the outcome cannot happen without that condition.