Option 3, "Object permanence and deferred imitation," is the correct answer because these are indeed two critical cognitive development milestones of the sensorimotor stage in Piaget's theory of cognitive development. 1. Object Permanence: This is the understanding that objects continue to exist even when they cannot be seen, heard, or touched. It is a fundamental concept developed during the sensorimotor stage, typically between the ages of 0 to 2 years.…Read More