In which sensorimotor substage would an infant be most likely to enjoy pushing buttons on a toy and making different animals pop up?

A) primary circular reactions
B) secondary circular reactions
C) reflexes
D) mental representations

Secondary Circular Reactions

Part of Jean Piaget's theory of cognitive development, representing repetitive behaviors in infants aimed at reproducing interesting effects in their environment.

Mental Representations

Internal images, concepts, or thoughts that stand in for objects, events, or relations in the outside world, aiding in understanding and interaction.