Cellular respiration occurs in the body 24 hours per day. During exercise, the rate of cellular respiration increases. Why does increased cellular respiration cause people to breathe faster?

A. More heat is generated by the body, and breathing cools the body quickly.
B. More water is lost from the body, and breathing hydrates the body.
C. More nutrients are needed to produce more energy, and more oxygen must be removed from the body.
D. More oxygen is needed to produce more energy, and more carbon dioxide waste must be removed from the body.