The National Day Care Study came up with three variables that influence quality early child care

A) Group size, whole class instruction, and caregiver qualifications
B) Ability levels, caregiver-child ratio, and caregiver qualifications
C) Group size, caregiver-child ratio, and caregiver philosophy
D) Group size, caregiver-child ratio, and caregiver qualifications

The National Day Care Study identified three factors that were important in determining the quality of early child care: group size, caregiver-child ratio, and caregiver qualifications. Choice A is incorrect because whole class instruction is not one of the identified factors. Choice B is incorrect because ability levels are not mentioned in the National Day Care Study. Choice C is partially correct but misses the third factor of caregiver qualifications. Therefore, the best choice is D, which accurately lists all three identified factors.