If laura has bipolar disorder, then she a experiences flashbacks interspersed with depression b never thinks about the risk that a major depressive episode will follow a manic episode c often experiences mood states that vacillate between depression and mania d once started a day euphoric and ended the day tired

 The answer is "C"(often experiences mood states that vacillate between depression and mania)

Bipolar disorder, a while ago known as manic depression, refers to an mental issue that reasons periods from claiming despondency and periods about abnormally raised temperament and causes unusual changes in mood. Those raised temperament will be critical and will be known as manhunt or hypo mania.