Which Statement Best Exemplifies the Etiology of Fibromyalgia

Which statement best exemplifies the etiology of fibromyalgia?

A) Stress and poor sleep hygiene are the main precipitating factors for fibromyalgia.
B) No exact cause is known, but some clients with fibromyalgia may have precipitating factors.
C) The primary cause for fibromyalgia in nearly all clients who have it is infection.
D) Precipitating factors for fibromyalgia are primarily physiological.