The answer is option C) Breathe
Your heart is not required to stretch, lift weights or perspire. If your heart is not strong enough or efficient enough it can be difficult to breathe. This is why some people need or get heart surgery. Their heart is not strong enough to pump blood through the lungs. Pumping blood is vital because the heart pumps the blood to the lungs, and the lungs is what helps you breathe.
Best Of Luck,
The Divergent