Answer:
(C) Atherosclerosis
Explanation:
The most common cause of myocardial ischemia is atherosclerosis.
Idiopathic vasospasm is not the major cause of myocardial ischemia.
Arterial emboli from heart valve may cause ischemia, but atherosclerosis is the major cause of myocardial ischemia.
And venous emboli cannot lead to myocardial ischemia.
