Cerebellar circuitry coordinates behavior by
a. inhibiting in appropriate muscle groups
b. disinhibiting appropriate muscle groups
c. responding to changes in head tilt, or posture and muscle disposition
d. all of the above
e. none of the above

C. responding to changes in head tilt, or posture and muscle disposition                                    

Explanation:

The cerebellum receives information from the sensory systems, the spinal cord, and other parts of the brain and then regulates motor movements.

The cerebellum coordinates voluntary movements such as posture, balance, coordination, and speech, resulting in smooth and balanced muscular activity.