Which Is NOT a Criticism of Piaget's Theory

Which is NOT a criticism of Piaget's theory?

A) Infants understand the basics of the physical world at a far younger age than Piaget believed.
B) Babies understand human motivations at a far younger age than Piaget believed.
C) Babies' understanding of the world develops gradually,not in defined stages.
D) To understand how babies think,it's essential to ask their parents.