Hannah Is Playing with Her Seven-Month-Old Niece,Elie

Multiple Choice

Hannah is playing with her seven-month-old niece,Elie.She rolls a toy truck toward her and she tries to roll it back.One time the truck rolls behind a chair and is out of sight.Elie seems to forget about the truck and about the game they had both enjoyed playing.This is because Elie has not achieved:

A) conservation
B) sensorimotor memory
C) object permanence
D) egocentrism