All of the Following Statements Are True About Parkinson's Disease

All of the following statements are true about Parkinson's disease except which one?

A) It is a chronic progressive disorder of the motor system.
B) Common onset is in the fourth decade.
C) The incidence is higher among whites than among African Americans.
D) Bradykinesia is common in patients.
E) Patients exhibit a soft, barely audible voice and monotony of speech.