John Relies Solely on His Vision to Sit, Walk, and Stand

Multiple Choice

John relies solely on his vision to sit, walk, and stand erect. If someone turns off the lights, he loses all control of movement and crumples to the floor like a rag doll. Most likely, John has lost the functioning of his ______.

A) proprioception sense
B) skin senses
C) vestibular sense
D) interoceptive sense