Barrabas watches as his mother leaves the room, but he does not cry because he understands that his mother still exists even though he cannot see her. This is an example of which reaction concept?

A. Sensorimotor substage 2: First habits and primary circular reactions
B. Sensorimotor substage 1: Simple reflexes
C. Sensorimotor substage 3: Secondary circular reactions
D. Sensorimotor substage 4: Object permanence


Answer: D

Psychology

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