Passage Summary: Some rules are so important for a society to work that you have to follow them even if it's bad for you personally.

Reasoning: Duties are defined as rules so fundamental that individual self-interest cannot override the obligation to follow them.

Analysis: This stimulus sets up a hierarchy where social duty sits firmly on top of individual self-interest. Since we are completing the argument, we need a statement that flows naturally from the idea that duties are non-negotiable for the sake of society. Look for an answer that suggests social stability requires individuals to occasionally act against their own best interests. It’s the classic 'needs of the many' logic—sometimes you have to keep your word even if it means losing a few bucks.