Trey’s older sister is playing a game with him. She hides the ball they are playing with, and Trey 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 Trey has not yet developed:.a. a strong attachment to his sister.
b. sensorimotor patterns of responding.
c. the ability to assimilate new experiences.
d. an understanding of object permanence.

b. sensorimotor patterns of responding

Explanation:

Sensorimotor skills involve the process of receiving sensory messages (sensory input) and producing a response (motor output). ... This sensory information then needs to be organized and processed to be able to produce an appropriate motor, or movement response to be successful in daily tasks at home or at school. She has not fully developed her sensorimotor pattern of responding hence him taking up a new toy.

responsibilities im assuming