Which theorist had a greater tendency to look for qualitative shifts in children's cognitive development?

Active, happy babies and passive, unresponsive babies tend to be treated differently. In other words, an infant's temperament phenotype may alter how others respond to him or her. What type of genotype-environment correlation is this an example of?

A. Active B. Evocative C. Passive D. Persuasive

What is the age range bound by the four stages of Piaget's theory?

a. Birth through adolescence b. Toddlerhood through adolescence c. Birth through adulthood d. Birth through toddlerhood