Roger Is Shown Two Piles of Sand and Says That

Multiple Choice

Roger is shown two piles of sand and says that each pile has the same amount. However,when one pile is flattened with a shovel,he now claims emphatically that the flattened pile has less sand. Piaget would suggest that Roger is in the ________ stage of development.

A) concrete operations
B) sensorimotor
C) formal operations
D) preoperational