You Tried to Play Peek-A-Boo with Your Six-Month-Old Infant, but Whenever

Multiple Choice

You tried to play peek-a-boo with your six-month-old infant, but whenever you hid your face, he would cry. You try it again three months later, and now he laughs and enjoys the game, trying to uncover your face with his hands. Your baby has now developed

A) egocentrism.
B) object permanence.
C) hindsight bias.
D) conservation.