In most countries, minors become adults when they become 18 however they may be underage to drink alcohol as in many countries as the minimum age of drinking is 21. So if anyone found guilty of underage drinking then he may get some legal consequence.
Fines are the most common legal consequence that an underage drinker can get. The other consequences are a cancellation of driving license, possible jail time, awareness classes, community services, etc. Therefore the right answer is- Fines.
