A 58-year-old man presents to the emergency department with acute onset severe substernal chest pain radiating to the left arm and jaw, associated with diaphoresis and dyspnea. His 12-lead ECG shows ST elevation ≥1 mm in leads I and aVL with reciprocal ST depression in leads II, III, and aVF. The pattern marked **A** in the diagram is consistent with acute lateral STEMI. Which of the following is the most likely culprit vessel responsible for this presentation?
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