Answer:
#1 = C.
#2 = Try to explain to them what type of problems they could cause towards the people around them and the harm that they will be doing to themselves.
#3 = They can try to tell you how much better it would make you feel or how helpful it could be. Like for example, stimulant drugs can keep you hyped up and more energized to where you can do all kinds of stuff without being exhausted although stimulant drugs do calm down ADHD kids. And there is another category that has all kinds of drugs that keep you more calm and relax but I had forgotten what it's called. This is not the answer to number 3 but maybe this can be helpful for you.
HOPE THIS HELPS!!! :P