. is a condition that causes narrowing of the coronary arteries so blood flow to the heart muscle is reduced. a. coronary artery disease b. heat cramps c. high blood pressure d. stress

a. CAD or coronary artery disease Heat cramps doesn't make sense, and stress can cause high blood pressure, which can be from the narrowing of arteries, but CAD is the only one that specifically affects the arteries to the heart.