Researchers Have Given Children Either Psychostimulant Drugs or Placebo for Attention-Deficit/hyperactivity

Researchers have given children either psychostimulant drugs or placebo for attention-deficit/hyperactivity disorder. They were interested in mothers' reaction to their children. What did they find?

A) Parent's behavior seems to be the primary cause of much of a child's hyperactivity.
B) When their children are on medication, mothers are less negative and less controlling.
C) Based on the response of parents, the effects of psychostimulant can be attributed to a placebo effect.
D) Parents do not seem to respond any differently to children when they are on or off psychostimulant medication.