Which of the following infant behaviors demonstrates the concept of object permanence?

Object permanence occurs when the infant learns that something/someone still exists even though they might not be able to see it/them. This develops between 9 and 10 months of age. If the infant cries when his mother leaves the room, it might be because he believes she is no longer in the house when he can't see her. If an infant picks up another toy after the one he is playing with rolls under the couch and the infant fails to look for it, he believes the toy that rolled under the couch no longer exists. Patty-cake is a game infants engage in but, it has nothing to do with object permanence. An infant game that does show object permanence is peek-a-boo. In this game, an infant continues to hunt for a hidden face because he believes it is still there.