A Parent Asks the Nurse Why His School-Aged Child, Who

A parent asks the nurse why his school-aged child, who was ill so often during the preschool years, is now healthy and seldom ill. Which of the following is the nurse's best response?

A) "The production of antibodies is at a peak by age 7 with the increase in body size and the maturity of the immune system."
B) "School-aged children usually eat a healthier diet, sleep better, and are less stressed than younger children."
C) "The school-aged child is exposed to the same people every day and has little exposure to new pathogens."
D) "School-aged children have had all their vaccinations and have had most health problems corrected by this time."