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 jurisdictions have stringent laws regarding the transportation of open containers of alcohol to prevent public intoxication and reduce alcohol-related incidents. These regulations are in place to maintain public safety and ensure responsible alcohol consumption. Open containers are often defined as any vessel that has been opened and contains alcohol, and laws typically prohibit individuals from having these containers in certain areas, especially in vehicles.

While actions like serving food in a tavern, displaying liquor advertisements, and hanging a beer sign in a window may be subject to some regulations, they do not carry the same level of strict regulation as open container laws. Serving food might have health and safety regulations to comply with, and advertisements require adherence to marketing guidelines, but these aspects are not as closely monitored in terms of immediate public safety as the transportation of open alcoholic containers.