What Is the Major Difference Between Primary Circular Reactions and Secondary

What is the major difference between primary circular reactions and secondary circular reactions in Piaget's sensorimotor stage?

A) An infant must first demonstrate the primary circular reactions before demonstrating the secondary circular reactions.
B) Primary circular reactions are based upon enjoyment activities,whereas secondary circular reactions are not.
C) Primary circular reactions bring about a desirable consequence,whereas secondary circular reactions do not.
D) Primary circular reactions involve activities where the infant is focused on its own body,whereas secondary circular reactions involve activities where the infant's actions relate to the outside world.