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Final answer:Betty's alternation between depressive and manic episodes suggests a potential diagnosis ofbipolar disorder. While her depressive episodes are characterized by sadness and disinterest, her manic episodes involve euphoria and reckless behaviors. This oscillation between emotional extremes is characteristic of bipolar disorder, which a mental health professional should diagnose. The correct option is b. bipolar disorderExplanation:Based on thesymptomsdescribed, Betty could be diagnosed with bipolar disorder. This diagnosis is due to the alternation of two extreme emotional states - depression and mania. Betty's feelings of lethargy, hopelessness, fatigue, and lack of interest indicate a depressive phase, characterized by intense and persistent sadness, sense of worthlessness, and decreased interest inactivities.Conversely, her feelings of extremeeuphoriaand engagement in risky behaviors such as sexual exploits and irresponsible spending indicate a manic phase. During a manic episode, individuals may experience an excessively euphoric mood, become excessively talkative, exhibit inflatedself-esteem, and engage in pleasure-seeking activities that could have harmful consequences.Unlike other disorders such as majordepressive disorderor persistent depressive disorder, which involve primarily depressive symptoms, bipolar disorder is marked by dramatic shifts in mood and energy. This swinging between manic and depressive episodes is a hallmark of bipolar disorder. It's crucial to remember that a professional mental health expert should make anypsychological diagnosis, following a detailed evaluation. The correct option is b. bipolar disorderLearn more aboutbipolar disorderhere:brainly.com/question/33359051#SPJ11...