Which type of intervention is classified as universal for reducing drinking age?

Universal interventions are designed to target the entire population or a broad segment of it, regardless of individual risk levels or specific circumstances. In the context of reducing drinking age, a universal intervention would involve strategies and programs that aim to influence the entire youth population, such as public health campaigns that promote awareness of the negative consequences of underage drinking.

These interventions are often implemented across various community settings, schools, or general public forums, ensuring that all members of the population have access to the information and resources, regardless of their personal drinking behaviors or risk factors. The goal is to create a normative change in attitudes and behaviors around alcohol consumption among the youth as a whole, thereby contributing to a safer environment regarding alcohol use.

In contrast, selective interventions focus on specific subgroups within the population that are identified as at-risk or vulnerable, while indicated interventions are aimed at individuals who have already begun to exhibit problematic behaviors. Targeted interventions may address a specific issue but often within a narrower scope as well. In this case, since the question pertains to a broad approach to reducing drinking age among all youth, universal is the most appropriate classification.