If Your Child Invented an Imaginary Companion That He Talked

If your child invented an imaginary companion that he talked to, played with, and slept with, how should you react?

A) You should punish the child when he mentioned his "friend."
B) You should encourage the child to play with his "friend."
C) You should refuse to acknowledge the friend and ignore your child when the "friend" was mentioned.
D) You should take your child to a doctor for a health evaluation.