Which statement most accurately describes the process of respiration

Hello. This question is incomplete. The full question is:

"Which statement most accurately describes the process of respiration?

a. It occurs only in plants during the daylight hours and usually involves the exchange of gases.  b. It occurs only in plants during the daylight hours and involves the taking in of preformed organic molecules.  c. It occurs continuously in the cells of all organisms and involves the synthesis of carbohydrate molecules.  d. It occurs continuously in the cells of all organisms and often involves an exchange of gases."

d. It occurs continuously in the cells of all organisms and often involves an exchange of gases.

Explanation:

Cellular respiration is a process in which the cell produces energy from glucose and in the presence of oxygen. This process, which occurs in the cytoplasm and mitochondria, is extremely important and complex, being responsible for the complete oxidation of glucose, which obeys the following reaction: C6H12O6 + 6O2 → 6CO2 + 6H2O + ENERGY

Cellular respiration occurs continuously in the cells of all organisms and often involves an exchange of gases, as you can see in the equation above.

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