If We Take a Developmental Systems Approach in Looking at the Effects

If we take a developmental systems approach in looking at the effects of formal education on children's development, we must conclude that the quality of children's classroom experiences is influenced:

A) Primarily by what teachers do in the classroom
B) Primarily by how children think about classroom material
C) Both by classroom events and by what children themselves do
D) Largely by things that have happened to children in the past