The Mother Tells the Nurse, "I Am So Concerned About

The mother tells the nurse, "I am so concerned about my child. He may not have adequate immunity to chicken pox." What is the best response by the nurse?

A) "We can draw a titer to determine if there is adequate immunity."
B) "There really is no way to know if your child will develop chicken pox."
C) "We can give your child another booster if you would like."
D) "You don't have to worry as long as your child has received all of his vaccinations."