While marijuana is legal in many states, it is not legal for those under 21. Why is this an age limit an important part of safe recreational use?

(A) Adults rarely develop issues with drugs and alcohol.

(B) This law has more to do with keeping marijuana comparable to alcohol than safety.

(C) Marijuana has a greater negative impact on teens than adults.

(D) Teens are not able to regulate their own behavior, so the law does.