A 75-year-old woman arrives at the emergency department and states that her left arm is numb. She is diaphoretic. Laboratory studies show an elevated troponin I level, and the patient is treated for an acute MI. A subsequent echocardiogram shows a wall motion abnormality of the posterior interventricular septum. Stenosis which of the following arteries would most likely cause this condition?
(A) Acute marginal artery
(B) Circumflex artery
(C) Left anterior descending artery
(D) Posterior descending artery
(E) Right coronary artery
