Sixty-five-year-old Laurie has only one brother and her parents were both only children. Laurie and her brother each have only one child. Laurie has a daughter and her brother has a son. Their family can be described as a family.

What was piaget's explanation as to why preschool-age children in the preoperational stage make errors on tasks requiring conservation? a) preschool children's tendency toward centration prevents them from focusing on other relevant features of a situation b) preschool children have not yet developed numerical understanding; therefore, different amounts are meaningless c) preschool children's neural-visual network is not fully matured d) preschool children have not lived long enough and accrued enough experience to know the difference between quantities