Q: The coronary arteries branch off of the aorta very shortly after the aorta leaves the heart. Compared to other tissues of the body, the capillaries of coronary flow are very close to the aorta. Therefore the primary challenge the coronary arteries face in delivering blood flow to the heart is
A		preventing atherosclerotic lesions from blocking the flow around the vessels.
B		maximizing the blood pressure due to the narrow flow path from the aorta.
C		ensuring smooth flow rather than the variable pressures from the systole and diastole of the heart.
D		minimizing the blood pressure to prevent bursting of the coronary vessels.

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