Which infant behavior best demonstrates object permanence?

Question

Quizplus · Accepted Answer

Crying and reaching for a favorite toy that has been put inside a toy box demonstrates object permanence. The infant understands that the toy still exists, even though it is no longer visible. Repeatedly swiping at a mobile hanging over the crib, crying when someone grabs a toy out of your hand, and trying to grab a toy that is just out of reach may demonstrate other developmental milestones, but not specifically object permanence.

Which Infant Behavior Best Demonstrates Object Permanence