The Research of Psychologist Renée Baillargeon Suggests That Infants Achieve

The research of psychologist Renée Baillargeon suggests that infants achieve an understanding of object permanence much earlier than Piaget's theory states. Why did Piaget underestimate the cognitive abilities of very young infants?

A) Piaget did not take cultural influences into account in developing his theory.
B) Piaget confused emotional immaturity with cognitive immaturity.
C) Piaget used tasks that required the infant to have reached a certain level of motor skill development, while Baillargeon used visual tasks to test for object permanence.
D) Piaget lacked access to the brain-imaging technology that Baillargeon and other contemporary psychologists have used to measure cognitive abilities in very young infants.