A 58-year-old man presents to the emergency department with acute-onset substernal crushing chest pain radiating to the left arm and jaw, accompanied by diaphoresis and dyspnea. A 12-lead ECG is obtained within 8 minutes of arrival and shows ST-segment elevation in leads V1–V6, I, and aVL, with reciprocal ST-segment depression in leads II, III, and aVF. The pattern marked **A** in the diagram is consistent with acute anterolateral STEMI. Which of the following coronary artery lesions is the most likely culprit?
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