At various times, cynthia, a 20-year-old college student, has been considered by her family and/or friends to be moody, high-strung, explosive, or hyperactive. she never fails to take care of her responsibilities, but the fact that she seems to experience mood swings that are outside the norm has been noticed by those around her. knowing the criteria for mood disorders, you would diagnose cynthia with

   Cyclothymic disorder

Explanation:  Cyclothymic disorder is a group of bipolar mental disorders, more precisely a mild form of bipolar mental disorder, which means moving from a certain form and type of mood, such as mild depression, to a certain  opposite mood such as emotional peaks and ups. This is why they are called manic depressive moods or disorders. It should be said that this mental disorder does not have as extreme a mood change as other bipolar disorders, but there are emotional ups and downs here.