Final answer:
The right and left coronary arteries receive their blood supply from the aorta, just above the aortic semilunar valve. The correct option is c.
Step-by-step explanation:
The right and left coronary arteries receive blood from the aorta. This occurs just superior to the aortic semilunar valve, where the coronary arteries arise from two of the three sinuses in the ascending aorta. Specifically, the left coronary artery arises from the left posterior aortic sinus, while the right coronary artery arises from the anterior aortic sinus. These arteries supply blood to the myocardium and other components of the heart.