Kevin and His Mother Are Playing with a Squeaky Toy

Multiple Choice

Kevin and his mother are playing with a squeaky toy. Kevin's mother squeezes the toy in front of him and then hides it under a blanket. Kevin has fun finding the toy under the blanket and then giving it back to his mother. After several rounds of this game, Kevin's mother hides the toy behind a pillow instead of under the blanket. Rather than looking behind the pillow, however, Kevin lifts the blanket to look for the toy. Which statement is true?

A) Kevin does not know the toy still exists.
B) Kevin is making the A-not-B error.
C) Kevin is approximately 6 months old.
D) All of these statements are true.