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

Multiple Choice

You tried to play peek-a-boo with your six-month-old nephew, 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 nephew has begun to develop

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