Final answer:
It is illegal to serve alcohol to an intoxicated person, regardless of their intent to drive, and this law applies widely. No consent form can legalize serving alcohol to an intoxicated person.
Step-by-step explanation:
The law regarding serving alcohol to individuals who are intoxicated is quite clear. Option c) It is illegal to serve them alcohol, is the correct response. Serving alcohol to an intoxicated person is generally against the law in many jurisdictions, and this law applies irrespective of whether the person is driving or not. Establishments that serve alcohol, such as bars and restaurants, have a responsibility not to serve alcohol to individuals who are visibly intoxicated. Doing so can lead to serious legal consequences for both the server and the establishment.
There are liability concerns that come into play when serving intoxicated individuals. For example, if an intoxicated person were to cause harm or damage after being served more alcohol, the establishment that served them could be held responsible for 'over-service'.
Additionally, signed consent forms or even parental consent have no legal standing in this scenario. Underage drinking laws and consent issues aside, once an individual reaches a state of intoxication, serving them more alcohol will generally be against the law.