Which of the following actions is strictly regulated under liquor laws?

The action that is strictly regulated under liquor laws is transporting open alcoholic containers in public. Many states have specific regulations that prohibit individuals from having open containers of alcohol in certain public areas. This regulation is usually aimed at preventing public intoxication and maintaining order in public spaces.

Open container laws vary by jurisdiction, but they often include restrictions about the types of vehicles where open alcohol is not allowed, as well as rules about designated areas such as parks or streets. Violating these laws can result in fines and legal penalties.

In contrast, while serving food in a tavern, displaying liquor advertisements, and hanging a beer sign in a window may be subject to regulation, they typically do not have the same level of strict legal consequences that open container laws do. These activities are often more about local ordinances, licensing requirements, and business regulations rather than outright prohibitions like those associated with open containers in public settings.