You are answering a USMLE-style medical question. Question: A 30-year-old Japanese woman is brought to the emergency department after fainting at work. She says she was only unconscious for a moment and recovered quickly. She reports increasing fatigue and joint pain for the past 4 months. Her blood pressure is 90/60 mm Hg, and her temperature is 36.6°C (98.0°F). On physical examination, the patient is fully conscious. Her radial pulse is absent at her right wrist and 1+ at her left wrist. Laboratory findings are significant for the following: Hemoglobin: 10.9 g/dL Hematocrit: 34.7% Leukocyte count: 5,500/mm3 Neutrophils: 65% Lymphocytes: 30% Monocytes: 5% Mean corpuscular volume: 78.2 μm3 Platelet count: 190,000/mm3 Erythrocyte sedimentation rate: 56 mm/h What complications is this patient at risk for? Options: A) Myocardial infarction B) Tongue infarction C) Palpable purpura D) Polyneuropathy Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.