After Several Weeks of Feeling Apathetic and Dissatisfied with His

Multiple Choice

After several weeks of feeling apathetic and dissatisfied with his life,Mark has suddenly become extremely cheerful and so talkative that he can't be interrupted.He seems to need less sleep and becomes irritated when his friends tell him to slow down.Mark's behavior is indicative of

A) major depressive disorder.
B) rumination.
C) bipolar disorder.
D) learned helplessness.