Which of the Following Statements About Minor Illnesses During the Preschool

Which of the following statements about minor illnesses during the preschool years is true?

A) Minor illnesses decrease immunity to more serious diseases.
B) Most preschool children rarely get colds-one or two a year is typical.
C) Preschool children are more vulnerable to colds because their lungs are still developing.
D) When preschool children get a minor illness, it usually lasts 2 to 3 weeks.