The Parents of a 5-Year-Old Have Just Found Out That

The parents of a 5-year-old have just found out that their child has head lice. Which statement by the parents would support the nursing diagnosis of deficient knowledge?

A) "I can't believe it. We're not unclean, poor people."
B) "We'll have to get that special shampoo."
C) "Everybody in the house will need to be checked."
D) "That explains his complaints of itching on his neck."