You are answering a USMLE-style medical question. Question: A 72-year-old man with hypertension and type 2 diabetes mellitus is admitted to the hospital for the evaluation of breathlessness and fatigue. His pulse is 100/min, and blood pressure is 90/60 mm Hg. Further evaluation shows a systemic vascular resistance of 35 mm Hg × min/L with an end-systolic volume of 80 mL. Which of the following describes the ejection fraction in this patient? Options: A) 30% B) 15% C) 25% D) 20% Reply with ONLY the letter of the correct answer (A, B, C, or D). No explanation.