A 40-year-old woman is brought by her husband for complaint of abnormal behavior. During the interview, she laughs and cries with a very sho period of time spontaneously. Her affect is best described as?

Labile affect Labile mood Sudden alterations in emotional responses, not related to environmental events Alternates between euphoric and dysphoric moods Apathy: Lack of concern Blunted affect: Greatly decreased display of emotional responses Euthymic: Normal mood, with no significant depression or elevation of mood