You are over at a friend's house in the backyard and his son,

Sam is taking a stick and waving it through the air, making airplane noises. You then take the stick and push it along the ground, making car noises. Sam angrily takes back the stick and says, "No, it's a plane!" Sam appears to be in Piaget's stage.
a. preoperational
b. concrete operational
c. formal operational
d. sensorimotor

ANSWER: a