You are answering a USMLE-style medical question. Question: A 42-year-old woman with a history of depression and headaches presents to the emergency room with severe, pulsating pain around the crown of her head beginning 12 hours ago. She last took ibuprofen 2 hours ago but did not feel any improvement in the pain. She has been nauseous and unable to get out of bed and is currently laying in the dark with the lights off. Her depression has improved, and she has stopped taking her sertraline 2 months ago. Other than ibuprofen as needed, she is not currently taking any additional medications. Which of the following would be the best treatment for her acute symptoms? Options: A) No treatment necessary B) 100% oxygen C) Propranolol D) Sumatriptan Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.