Ability to engage in deferred imitation and make belief play in Piaget's theory marks the transition from a sensorimotor approach to the world to a cognitive based approach based on

Correct option is A

The ability to engage in deferred imitation and make-believe play signifies the development of mental representation in Piaget's theory. Mental representation allows children to hold images of objects and actions in their minds, facilitating imaginative play and the imitation of behaviors observed in the past.