Passage Summary: The author claims everyone is selfish because you can always come up with a selfish reason for why someone did something nice.

Conclusion: Every human action is driven by a desire for personal gain.

Reasoning: Any act that appears to be for the benefit of others can be reinterpreted or described as being done for a selfish reward.

Analysis: This argument is a bit cynical, assuming that every bake sale is a secret power play just because we can imagine a selfish motive. The flaw lies in the jump from 'can be described as' to 'is motivated by.' Just because a behavior is compatible with a theory doesn't mean the theory is the only possible explanation. Look for an answer that highlights how the author treats a mere possibility of self-interest as a proven fact.