Gerald Has Experienced Increasing Difficulties with Muscle Weakness,motor Coordination,and Body

Multiple Choice

Gerald has experienced increasing difficulties with muscle weakness,motor coordination,and body balance,which his doctor has diagnosed as multiple sclerosis.These symptoms are most likely to be directly linked with the degeneration of

A) endorphins
B) synaptic gaps.
C) the pituitary gland.
D) the myelin sheath.