No certificate holder may serve any alcoholic beverage to any person aboard its aircraft who:

The statement that no certificate holder may serve any alcoholic beverage to a person aboard its aircraft who appears to be intoxicated aligns with the Federal Aviation Administration (FAA) regulations that prioritize safety and responsible service of alcohol. This regulation is in place to ensure the well-being of all passengers and crew on the aircraft.

Serving alcohol to someone who appears to be intoxicated can lead to safety hazards, heightened risk of disturbances onboard, and can impair a person's judgment, increasing the likelihood of accidents or incidents during the flight. Airlines are responsible for maintaining a safe environment and must intervene if they identify that a passenger may be under the influence of alcohol to the point of impairment.

The other choices do not align with regulations regarding the responsible service of alcohol on aircraft. Having a valid ID does not reflect on a passenger's level of intoxication, nor does escorting someone imply any compromised state. Additionally, being a first-time flyer does not indicate a need to restrict alcohol service, as it does not relate to the individual's intoxication status. The focus is solely on the state of intoxication when it comes to the responsible serving of alcoholic beverages onboard.