You are answering a USMLE-style medical question. Question: A 22-year-old woman presents with recurrent episodes of swelling in her face, hands, and neck with occasional abdominal pain. The symptoms usually resolve in 2 to 3 days. She has had these swelling events her whole life; however, they have become more debilitating recently. Last week she had an event that restricted her ability to eat and swallow. Past medical history is noncontributory. Her father is alive and well with no significant medical history. Her mother and her maternal aunt have a similar condition. Today, her physical exam is within normal limits. She brought a picture of her swollen hand as seen in the picture. The treating physician has a strong suspicion of an inherited disorder. C1-inhibitor levels are ordered and found to be extremely low. Which of the following is the most likely diagnosis of this patient? Options: A) Chediak-Higashi syndrome B) Wiskott-Aldrich syndrome C) Paroxysmal nocturnal hemoglobinuria D) Hereditary angioedema Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.