A Behaviorist Is Giving Childrearing Advice

A behaviorist is giving childrearing advice.Which tip is this person LEAST likely to give?

A) Ignore bad behavior (or don't reinforce it) by paying attention to a child.
B) Pay attention when a child does something positive and reinforce a child for good behavior.
C) To encourage a child to persist at an activity,reinforce the child every time he performs that action.
D) To discipline a child,be consistent.Never give in because the child whines.