Dr Perfectionist Is Criticizing Some of Piaget's Ideas

Dr. Perfectionist is criticizing some of Piaget's ideas. She can legitimately make which statement?

A) "The transition from preoperations to concrete operations occurs spontaneously."
B) "In other societies, children reach specific conservations earlier, showing that you can teach children to conserve."
C) "Children are more egocentric than Piaget believed."
D) "There is no universal change from preoperational to concrete operational thought."