Troy's Older Sister Is Playing a Game with Him

Multiple Choice

Troy's older sister is playing a game with him. She hides the ball they are playing with and Troy quickly loses interest in the game. He makes no attempt to look for the ball and instead picks up another toy that is close by. This suggests that Troy has not yet developed

A) the ability to assimilate new experiences.
B) an understanding of object permanence.
C) a strong attachment to his sister.
D) sensorimotor patterns of responding.