1. All of the following are true about the course of a major depressive disorder except A. Five to 10 percent of persons with a single episode will eventually develop bipolar disorder. B. Thirty percent of patients recover within 6 months with or without treatment. C. The recurrence rate is high, especially after two or more episodes. D. Sudden onset of depression is usually associated with a severe psychosocial stressor. E. The interepisode interval is less with an increasing number of episodes.