A 65-year-old man with a history of hypertension and type 2 diabetes presents to the emergency department with 2 hours of substernal chest pressure that radiates to his left jaw. The pain is associated with diaphoresis and shortness of breath. His blood pressure is 160/90 mmHg, and his heart rate is 110/min. An ECG reveals ST-segment elevation in leads II, III, and aVF. Which of the following is the most likely affected coronary artery?