Don’t lie and don’t steal? Be a buddy not a bully? Don’t judge some one till you have walked around in their shoes for a day?
Answer:
Myelin is an insulating layer, or sheath that forms around nerves, including those in the brain and spinal cord. It is made up of protein and fatty substances. This myelin sheath allows electrical impulses to transmit quickly and efficiently along the nerve cells.
out of the options I think "A" your first option sounds the most right. sorry if I'm wrong..hope my answer helps!