Why Do People with Parkinson Disease Experience Resting Tremors

Why do people with Parkinson disease experience resting tremors?

A) Damage to the cerebellum alternately activates agonist/antagonist muscle pairs.
B) Excess glutamate is released in the premotor areas of the motor cortex.
C) Dopamine-secreting tumors directly activate alpha motor neurons.
D) Acetylcholinesterase at neuromusclular junctions is inactivated.
E) Activation of the sensorimotor cortex is reduced when the substantia nigra fails to deliver dopamine to the basal nuclei.