Rikki Normally Breastfeeds Her Baby Chloe;however,during the Workday Rikki's Mother

Rikki normally breastfeeds her baby Chloe;however,during the workday Rikki's mother watches Chloe,and the baby must be fed with a bottle.Rikki has noticed that Chloe's approach to the bottle is somewhat different than Chloe's approach to her breast.What would Piaget say this is an example of?

A) coordination of secondary circular reactions of the sensorimotor stage
B) simple reflexes of the sensorimotor stage
C) mental representations of the beginning of thought
D) first habits and primary circular reactions of the sensorimotor stage