By Moving, Breathing, and Living, You Do Work Every Day

By moving, breathing, and living, you do work every day.Work requires energy.Where does this energy come from?

A) The energy comes from food; it undergoes chemical reactions in the cells.
B) The energy does not come from anyplace; it is always in our bodies.
C) The energy comes from breaking bonds in food.
D) The energy comes from breaking bonds in food, oxygen, and water.
E) No one really understands where this energy comes from.