Which behavior reflects an infant's understanding of object permanence?

The choice that illustrates an infant's understanding of object permanence is when they search for a toy under a blanket. This behavior demonstrates that the infant recognizes that objects continue to exist even when they are not visible. When an infant understands object permanence, they know that the toy they previously saw does not simply vanish when it is hidden.

The act of searching under a blanket indicates that the infant has formed a mental representation of the toy's location and is actively looking for it, showing their cognitive development and understanding of the continuity of the world around them. This behavior typically emerges in infants around 8 to 12 months of age as they begin to grasp that items exist independently of their immediate perception.