Final answer:
Strict penalties, increased educational programs, and enforcement are necessary for an effective policy about underage drinking.
Step-by-step explanation:
In order for a policy about underage drinking to be effective, all of the above options are necessary. Strict penalties for underage drinkers provide deterrents and consequences for breaking the law. Increased educational programs about the dangers of alcohol help raise awareness and inform young people about the risks involved. Enforcement and compliance checks at establishments selling alcohol ensure that the law is being followed and underage individuals are not able to purchase alcohol.