What is “Retreat” about?
选项：

A:.Take the children in trouble away from the situation, no matter what happened;
B:This technique can be used when a child is using aggressive behavior that may hurtthemselves or others;
C:It is intended to remove the child from a situation when the child has been warned of theaggressive behavior and explained that it is not acceptable behavior.
D:It is the best way of protecting children