Piaget's Sensorimotor Stage: Infants Learn Through Sensory Exploration

The answer is c. sensorimotor. Piaget's sensorimotor stage is the first stage of cognitive development, where infants learn about the world through their senses (sight, sound, touch, taste, smell) and motor actions (reaching, grasping, sucking, etc.). This stage is characterized by the development of object permanence, the understanding that objects continue to exist even when they are out of sight.