The Easiest and Most Practical Way to Control the Amount

The easiest and most practical way to control the amount of candy and carbonated drinks a child consumes is to:

A) prevent the child from knowing of their existence.
B) never let the child visit his grandparents.
C) limit the availability of these items.
D) teach the child that such foods are highly noxious.
E) let the child eat as much as they want until they don't want them anymore.