1-72Lori Has Periods of Dejection and Apathy That Are Not

1-72.Lori has periods of dejection and apathy that are not as severe as are seen in major depression.She also has periods when she abruptly becomes elated and has little need for sleep.Her symptoms never reach the level of psychosis,but the mood swings have been recurrent for over four years.The best diagnosis for Lori is

A) schizoaffective disorder.
B) bipolar I disorder.
C) recurrent dysthymia.
D) cyclothymia.