What Is the Major Physiological Importance of Breathing

What is the major physiological importance of breathing?

A) We need oxygen to survive.
B) It eventually produces water, which we need to survive.
C) We need to eliminate CO₂ from our system because it is a waste product.
D) We need to control our core temperature by breathing in oxygen from the environment.
E) Oxygen must be present in our cells to break down food into energy.