The right answer is B. The equation is glucose + oxygen ==> carbon dioxide + water and energy is produced in the form of ATP.
Cellular respiration is a complete breakdown of glucose in the presence of oxygen, allowing a total release of its energy.
Glucose is "burned" in the presence of oxygen in the cells of animals and plants.
Breathing releases energy stored in glucose (during photosynthesis). The majority of this energy is transferred to ATP which can be used by all cells.
And the waste of respiration is carbon dioxide and water, which are precisely the raw materials of photosynthesis in chloroplasts (= closed circuit).