DrPerfectionist Is Criticizing Some of Piaget's Ideas

Dr.Perfectionist is criticizing some of Piaget's ideas.She can legitimately make all of the following statements EXCEPT:

A) "Rather than occurring all at once,the transition from preoperations to concrete operations takes place gradually."
B) "In other societies,children reach specific conservations earlier,showing that you can teach children to conserve."
C) "Children are far less egocentric than Piaget believed."
D) "There is no universal change from preoperational to concrete operational thought."