In DSM-5, a manic episode is defined as lasting at least 1 week (or any duration if hospitalization is required) with a markedly elevated, expansive, or irritable mood and increased goal-directed activity.

• A. Manic episodes last at least 3 days with mild impairment.
• B. Manic episode lasts at least 1 week or requires hospitalization, with abnormally elevated, expansive, or irritable mood and increased goal-directed activity.
• C. Hypomanic episodes last at least 4 days with no impairment.
• D. Manic episodes require psychotic features.

Answer: (B)