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

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Piaget's concept of reversibility refers to a child's ability to mentally reverse an action, such as unrolling the clay back into a ball after it has been rolled into a disk. Lucas demonstrates this understanding by stating that the amount of clay in the disk is the same as the ball, as he could reverse the action and make it into a ball again. Therefore, the best choice is A) reversibility.

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