Answer:
Object Permanence
Step-by-step explanation:
Object permanence refers to the ability of a child to develop the mental representation (i.e. a schema) that an object is still in existence even when they are hidden and no more at sight. This concept was proposed by psychologist Jean Piaget in his theory of cognitive development, where he argued that children possesses this ability from birth to about age two during their sensorimotor stage of development