What is the primary restriction on minors loitering in venues that serve alcohol?

The primary restriction on minors loitering in venues that serve alcohol is that they must leave if no food is served. This regulation is designed to create a safer environment and limit the influence of alcohol on minors. In establishments that serve food along with alcohol, minors are typically permitted to be present because there is a focus on dining rather than solely on drinking. This rule helps balance the business interests of restaurants that serve alcohol alongside meals with the legislative efforts to protect minors from exposure to drinking environments that are not family-friendly.

Other options may address aspects of minors in alcohol-serving venues, but they do not capture the specific regulation related to the presence of food as a significant requirement for minors to remain in such establishments. For example, supervision by an adult is not a universal requirement in all alcohol-serving venues, and while minors are indeed restricted from ordering drinks, this does not address their presence in the venue altogether. The provision related to food effectively governs when and where minors can loiter, making it the correct and pivotal answer in this context.