B.) 13 million . Thats my guess anyways, sorry if it turns out wrong .
Answer:
Multiple sclerosis
Explanation:
Multiple sclerosis (MS) is a chronic, autoimmune and inflammatory disease of as yet unknown cause that characteristically affects the myelin sheath of axons within the Central Nervous System, the degree of destruction of the myelin sheath and axons is highly variable. When myelin is damaged, the messages that travel along the nerve fibers are interrupted, so: messages can be slower, distorted, short-circuited, or not pass at all, resulting in symptoms of the Multiple sclerosis
