Psychology Applied to Modern Life 11th Edition by Wayne Weiten,Dana Dunn,Elizabeth Yost Hammer

Exercise 6

After several months during which he was always gloomy and dejected, Mario has suddenly perked up. He feels elated and energetic and works around the clock on a writing project. He has also started to bet heavily on sporting events over the Internet, which he never did previously. Mario's behavior is consistent with
A) schizophrenia.
B) obsessive-compulsive disorder.
C) bipolar disorder.
D) dissociative identity disorder.