Which Is an Example of a Primary Circular Reaction

Multiple Choice

Which is an example of a primary circular reaction?

A) A newborn sticks out her tongue after she sees an adult model do so.
B) An infant repeatedly brings his hand to his mouth and sucks his fingers.
C) An infant learns to open her mouth in anticipation of feeding when her mother picks her up.
D) An infant turns his head to the side more frequently when head turning is followed by a sip of sugar solution.