Answer:
Kindney Cancer
Explanation:
Cancer in the kidneys can lead to a lack of enough red blood cells, called anemia. Red blood cells transport oxygen to your body's tissues. When you don't have enough of them, you'll become tired, pale, and short of breath. Renal cell cancer can also release substances that increase your blood pressure.
B is your answer, it can indicate when you are working above, below, or in your target zone.
