You are answering a USMLE-style medical question. Question: A 56-year-old man with a history of hypertension presents to his physician with progressive fatigue and new onset muscle cramps. He has had no recent changes to his medication regimen, which includes hydrochlorothiazide, lisinopril, and amlodipine. His temperature is 98.0°F (36.7°C), blood pressure is 174/111 mmHg, pulse is 70/min, respirations are 12/min, and oxygen saturation is 98% on room air. The patient's cardiopulmonary and abdominal exams are unremarkable. Laboratory values are ordered as seen below. Serum: Na+: 138 mEq/L Cl-: 100 mEq/L K+: 3.3 mEq/L HCO3-: 33 mEq/L BUN: 20 mg/dL Glucose: 129 mg/dL What is the most likely underlying etiology of this patient's hypertension? Options: A) Aldosterone excess B) Catecholamine-secreting mass C) Cortisol excess D) Impaired kidney perfusion Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.