Concept:Curtailing hard drug use means reducing its spread and discouraging people from starting or continuing to abuse drugs.
Explanation:Enlightenment is the best way to curtail hard drug use because it involves educating the public about the dangers and consequences of drug abuse.
When people are properly informed, they are more likely to make wise decisions and avoid experimenting with hard drugs.
Enlightenment campaigns create awareness in schools, communities, and the media about the health, legal, and social effects of drug abuse.
Unlike compensation or compromise, which do not address the root cause, enlightenment helps prevent drug abuse before it begins.
Although rehabilitation is useful for treating addicts, it only works after someone has already become dependent on drugs.
Therefore, prevention through enlightenment is the most effective and sustainable method to curtail the use of hard drugs.
Answer:C. enlightenment