Eight-Year-Old Lucas Is Shown a Ball of Brown Clay,which Is

Multiple Choice

Eight-year-old Lucas is shown a ball of brown clay,which is then rolled out into a large,flat disk.He is asked whether the disk contains the same amount of clay."It's the same amount," Lucas says,"because I could just make it into a ball again." In Piaget's terminology,Lucas understands the principle of

A) reversibility.
B) identity.
C) categorization.
D) horizontal décalage.