An 8-year-old boy begins to exhibit chronic, severe, persistent irritability associated with frequent temper outbursts. Which of the following disorders is he most likely to develop in adulthood?

Choice A reason: Borderline personality disorder is characterized by instability in relationships, self-image, and affect, but early chronic irritability in childhood is not a strong predictor of this disorder. Choice B reason: Schizophrenia usually presents in late adolescence or early adulthood with psychotic symptoms; chronic irritability alone is not predictive of schizophrenia. Choice C reason: Bipolar I disorder involves episodic mania and depression. Chronic irritability without distinct manic episodes is less predictive of developing bipolar disorder. Choice D reason: Persistent irritability and frequent temper outbursts in childhood, particularly when chronic and severe, are most predictive of developing unipolar depressive disorders in adulthood, reflecting an enduring affective dysregulation pattern.