For at Least the Last Two Years, Sara Has Been

Multiple Choice

For at least the last two years, Sara has been experiencing mild to moderate depression, which alternates with periods of her being cheerful and expansive, but also somewhat irritable. Although Sara is able to work and take care of her family, she and her family are both concerned about these emotional "ups" and "downs." Sara would most likely be diagnosed with

A) major depressive disorder.
B) bipolar I disorder.
C) cyclothymic disorder.
D) dysthymia.