Delirium Is Described as an Extreme Disturbance of Arousal,attention,orientation,perception,affect,and Intellectual

Delirium is described as an extreme disturbance of arousal,attention,orientation,perception,affect,and intellectual function accompanied by fear and agitation.What is the most common cause of postoperative agitation?

A) Organic brain disease
B) Hypoxemia
C) Preoperative anxiety
D) Excessive blood loss