Passage Summary: Selling a product isn't about changing what people want, but showing them that your product is what they already want; the argument suggests that winning over a voter works the exact same way.

Conclusion: One tries to convince the voter that a politician's policies will satisfy the voter's existing desires.

Reasoning: Sales is described as matching a product to a customer's existing desires rather than changing them, and political persuasion is stated to be no different.

Analysis: This is an analogy-based argument where the second half must mirror the first. The salesperson's role is to 'convince the customer that a particular product will satisfy [their desires].' Since the politician is the 'product' and the voter is the 'customer,' the missing piece must describe the act of showing the voter that the politician's policies align with what the voter already wants. Look for an answer that focuses on satisfying existing preferences rather than creating new ones.