Which situation presents the best example of positive peer influence?

The best example of positive peer influence is demonstrated by the situation where a teenager begins volunteering at a homeless shelter due to a friend's admiration. This scenario highlights how one individual can inspire another to engage in constructive behavior that benefits both the community and the individual’s personal growth. The admiration from the friend serves as a motivating factor for the teenager to take action in a positive direction, showcasing the power of peers to encourage altruistic behavior.

In contrast, choices that involve negative behaviors or peer pressure, such as skipping class to fit in, do not exemplify positive influence. Discouraging unhealthy habits within a group of friends also indicates a supportive environment but does not focus on an individual's proactive behavior inspired by admiration. Meanwhile, the choice where a teenager resists joining a sports team does not illustrate any form of influence, positive or negative; rather, it reflects personal decision-making without peer encouragement or pressure. Therefore, the first scenario stands out as an instance where positive peer influence leads to meaningful and constructive actions.