Which of the following is an example of a prompting strategy to prevent problem behavior?

The correct choice revolves around using a prompting strategy that facilitates learning by demonstrating a desired behavior. In this context, prompting a model for how to solve an algebra problem serves as a direct example of a prompting strategy. It involves showing the individual how to carry out a task, which not only guides them in the moment but also helps foster independence and problem-solving skills in the future. This modeling can reduce the likelihood of frustration and subsequent problem behavior that might arise when a learner is unsure how to proceed.

The other options, while they have their own benefits in educational or behavioral settings, do not serve primarily as prompting strategies in the same way. For instance, providing a checklist can be supportive but may not directly demonstrate behavior; instead, it serves as a means of organization. Giving direct instructions does prompt, but it lacks the modeling aspect that can enhance understanding. Similarly, using a reward system focuses on external motivation rather than directly teaching the behavior itself. Thus, modeling a solution is the most effective prompting strategy aimed at preventing problem behavior in this scenario.