Although He Is Often Dispirited,exhausted,and Pessimistic,for the Last Few Days

Multiple Choice

Although he is often dispirited,exhausted,and pessimistic,for the last few days Jirou has been studying,working out,and socializing with so much energy and enthusiasm that he has not had more than two or three hours of sleep each night.Jirou might be suffering from

A) a personality disorder.
B) panic disorder.
C) post-traumatic stress disorder.
D) bipolar disorder.