When watching an electric train, Amy will look ahead to the end of the tunnel, rather than staring at the spot where the train disappeared.Amy must be at least ___________ years old.
A) two
B) three
C) four
D) five

Question

Quizplus · Accepted Answer

Amy must be at least two years old to understand the concept of object permanence, which is the understanding that objects continue to exist even when they are out of sight.

When Watching an Electric Train, Amy Will Look Ahead to the End