Passage Summary: If you help someone just because you want people to think you're a good person, you don't actually deserve the credit.

Conclusion: A person who helps others mainly because they want praise does not actually deserve to be praised for that help.

Reasoning: Praise is only earned when an action is motivated by a desire to help others, whereas the desire for praise is defined as wanting others' good opinions as a sign of one's own goodness.

Analysis: The argument establishes a strict requirement for deserving praise: the motivation must be a 'desire to help others.' However, it concludes that a 'desire for praise' fails to meet this requirement without explicitly stating that the two motivations cannot coexist or that one isn't a subset of the other. To bridge this gap, we need an assumption that guarantees a person motivated by praise is not also sufficiently motivated by a genuine desire to help. Look for an answer choice that creates a mutual exclusivity between these two internal drivers.