If Parents Discover Their Child "Playing Doctor" with a Friend

If parents discover their child "playing doctor" with a friend, what reaction should they have?

A) Parents should harshly condemn the child's behaviour to ensure that it does not happen again.
B) Parents should take the opportunity to teach the child appropriate expression of sexuality.
C) Parents should ignore the child as if nothing ever happened.
D) Parent should separate their child from the friend for at least one year.