Multiple sclerosis arises through which mechanism?

1. Destroying or degrading myelin sheaths impairs signal transmission along nerve fibres. 2. In multiple sclerosis the body's own immune system attacks the myelin in the central nervous system. 3. Symptoms include fatigue, vision problems, weakness in the limbs, loss of balance and numbness in the extremities. 4. It strikes younger adults more often, and females more often than males. 5. Causes may involve infection, environment, geography or genetics, and no cure is known. 6. Muscle rather than myelin is the target in other conditions, so option one misplaces the tissue involved. _Source: OpenStax College Physics (CC BY 4.0), Ch 20 "Electric Current, Resistance, and Ohm's Law", section Nerve Conduction_