Final answer:
The National Minimum Drinking Age Act of 1984 sets the legal drinking age at 21, which means a 20-year-old cannot legally consume alcohol on a licensed premise. Mothers Against Driving (MADD) was instrumental in establishing this law to reduce underage drinking and driving.
Step-by-step explanation:
In the United States, the National Minimum Drinking Age Act of 1984 established the legal drinking age at 21. Therefore, a 20-year-old cannot legally consume alcohol on a licensed premise. The options provided in the question do not apply, as the law does not permit underage drinking on licensed premises under normal circumstances. There are a few exceptions to this rule in some states, such as when alcohol is consumed in private clubs or establishments, or for religious purposes, but these are not generally applicable and vary by state.
An organization called Mothers Against Driving (MADD) played a significant role in the establishment of the minimum drinking age by lobbying Congress. They advocated for the legislation to discourage irresponsible alcohol consumption and reduce incidents of driving, especially among youths.
Understanding the nuances of these laws is important, not only for legal compliance but also to recognize how such regulations impact social behaviors and responsibilities linked to alcohol consumption.