How Did Piaget Explain Why Preschool-Age Children in the Preoperational

How did Piaget explain why preschool-age children in the preoperational stage make errors on tasks requiring conservation?

A) Preschool-age children's neural-visual network is not fully matured.
B) Preschool-age children have not lived long enough to accrue enough experience spotting the differences between quantities.
C) Preschool-age children's tendency toward centration prevents them from focusing on other relevant features of a situation.
D) Preschool-age children have not developed numerical understanding;therefore,different amounts are meaningless.