Passage Summary: The author claims that because we feel good when we get what we want, the 'feeling good' part must be the only reason we wanted it in the first place.

Conclusion: The only fundamental desire humans have is the pursuit of pleasure.

Reasoning: Getting what one wants always results in pleasure, and pleasure is a natural consequence of satisfying a desire.

Analysis: This argument commits a classic 'confusing a byproduct with a goal' flaw. Just because a certain result (pleasure) always follows an action (getting what you want), it does not mean that result was the primary motivation for the action. It's like saying that because every car trip results in the engine getting hot, the only reason people drive is to heat up their engines. To match this flaw, look for an answer choice that identifies a universal side effect and incorrectly concludes it is the sole purpose of the behavior.