A Patient Presents with Muscular Rigidity, Constant Tremor, Slow Movement $\gamma$

Multiple Choice

A patient presents with muscular rigidity, constant tremor, slow movement (bradykinesia) , difficult voluntary movements, and rigid, mask-like features. Which neurotransmitter is lacking in this patient's brain?

A) dopamine
B) $\gamma$ -aminobutyric acid
C) acetylcholine
D) norepinephrine
E) glutamate