Melissa Has Been Depressed for the Last Two Months

Melissa has been depressed for the last two months.However,over the past couple of days she has become euphoric and hyperactive,and she runs around the apartment complex claiming that she alone could solve the world's energy problems.Melissa is suffering from

A) major depressive disorder.
B) bipolar disorder.
C) disruptive mood dysregulation disorder.
D) dissociative identity disorder.