Which of the following disorders is caused by the degenerative demyelination of motor neurons resulting in dysfunction of voluntary muscles?

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Amyotrophic lateral sclerosis is the degenerative demyelination of motor neurons resulting in motor dysfunction of voluntary muscles. Demyelination happens as a result of a disease of the nervous system in which the myelin sheath of neurons is damaged. The main purpose of myelin is to increase the speed at which electrical impulses travel along the myelinated fiber. The gif below compares the speed of electrical impulses traveling along a demyelinated motor neuron (left) and a neuron with its myelin intact (right).
 11ec0fb7_27fc_984a_95f0_19aa92e3b025_NR0002_00 11ec0fb7_27fc_984b_95f0_ab94dbda3fda_NR0002_00 11ec0fb7_27fc_984c_95f0_0d37aec14422_NR0002_00 Muscle strain is injury to the muscle or tendon while muscle sprain is the tear or stretching of the ligament.
Muscular dystrophy is the progressive reduction in muscle mass that can affect both voluntary and involuntary muscles.

Which of the Following Disorders Is Caused by the Degenerative