Which clinical condition is characterized by recurrent incidents of demyelination that affects axons in the optic nerve, brain, and spinal cord?

The clinical condition that is being described above is multiple sclerosis. This is a disease that occurs to an individual because of a presence of demyelination in the individual’s myelin with their brain and spinal nerve that causes the CNS to be disabled.

the answer is:

carbon dioxide

i think that it is c, d, and e, hope this