An example of Selective Prevention Strategy includes:

Selective prevention strategies are designed to target specific groups of individuals who are at higher risk for developing substance use disorders or engaging in other problematic behaviors. This approach focuses on subsets of the population that exhibit certain risk factors, allowing for more tailored interventions.

In the context of this question, the involvement of parent-peer groups for troubled youth represents a selective prevention strategy. This program specifically targets youth who are identified as at risk due to various factors like family history, social environment, or behavioral issues. The engagement of parents alongside peers also emphasizes community support and can provide a safety net for those in vulnerable positions, enhancing protective factors and resource networks that can help mitigate risk.

Conversely, the other options do not adequately fit the selective prevention model. A K-8 student health curriculum typically serves a broad population and is designed for general health awareness rather than targeting a specific at-risk group. Health policy changes, while potentially beneficial on a wider scale, tend to operate at a systemic level rather than focusing on individuals in high-risk categories. School assemblies may also reach a large audience without distinguishing between varying levels of risk among participants. Therefore, these approaches are more aligned with universal prevention or broad-based strategies rather than selective ones focused on specific at-risk groups.