When Reaching into Your Book Bag, You Accidentally Jab Yourself

Multiple Choice

When reaching into your book bag, you accidentally jab yourself on the sharp point of a pencil. You immediately move your hand away from the source of pain. The ability to move away when this happens is communicated to your muscles from your brain through:

A) hormones.
B) glia cells.
C) motor neurons.
D) sensory neurons.