For at Least the Last Two Years,Sara Has Been Experiencing

Multiple Choice

For at least the last two years,Sara has been experiencing mild depression which alternates with periods of her being cheerful and expansive,but also irritable.These changes in her mood appear to be reactions to external events,and she has never experienced a psychotic episode.Sara would most likely be diagnosed with

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