Which assertion is an assumption of stage theories?
Not all children pass through stages in the same order.
Transitions between stages can take a long time.
When children are in a given stage, a broad range of their behavior is consistent with that stage.
Transitions between stages are sporadic.
Which infant is unable to actively influence his environment?
Andrew, who is blind
Bobby, who is paralyzed
Elias, who is severely cognitively impaired
Andrew, Bobby, and Elias are all able to actively influence their environments.