Final answer:
C. Both a and b.
Both providing a model for how to solve an algebra problem and reducing the number of problems required are prompting strategies to prevent problem behavior, so the correct answer is C. Both a and b.
Step-by-step explanation:
An example of a prompting strategy to prevent problem behavior is providing a model for how to complete an algebra problem. This guidance can help by demonstrating the problem-solving process and potentially decreasing frustration or confusion that could lead to problem behaviors. Similarly, reducing the number of algebra problems required can also be seen as a prompting strategy because it adjusts the workload to a manageable level, helping to prevent overwhelm and the behaviors that might arise from it. Therefore, the answer to which of the options is an example of a prompting strategy to prevent problem behavior is C. Both a and b.