The correct option is
B Nervous degeneration causing involuntary shaking of legs, arms, head
Huntington's disease is a hereditary condition in which your brain's nerve cells gradually break down. It can cause physical and psychological symptoms.
The movement disorders associated with Huntington's disease can include both involuntary movement problems and impairments in voluntary movements, such as: Involuntary jerking or writhing movements (chorea) Muscle problems, such as rigidity or muscle contracture (dystonia) Slow or abnormal eye movements.
So, the correct answer is 'Nervous degeneration causing involuntary shaking of legs, arms, head'.