You are answering a USMLE-style medical question. Question: A 61-year-old woman presents to an outpatient clinic with fatigue and mild neck pain for a month. She adds that she is having difficulty swallowing. She denies trouble with her breathing but endorses 5–10 lb of unintentional weight loss over the past few months. On physical exam, the patient’s fingernails appear flat and mild conjunctival pallor is noted. An upper barium esophagram shows an upper esophageal web. A complete blood count reveals: Hb% 10 gm/dL Total count (WBC) 11,000 /mm3 Differential count: Neutrophile 70% Lymphocytes 25% Monocytes 5% ESR 10 mm/hr What is the most likely diagnosis? Options: A) Plummer-Vinson syndrome B) Esophageal squamous cell carcinoma C) Zenker’s diverticulum D) Achalasia Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.