The correct answers are: C. energy, D. water, and F. carbon dioxide.
Organisms use oxygen in a process called cellular respiration to break down sugar, which is a source of energy, into other products. During cellular respiration, sugar is broken down into water and carbon dioxide, and energy is produced in the form of ATP (adenosine triphosphate). Oxygen is consumed in this process, and carbon is a byproduct. Nitrogen is not involved in the breakdown of sugar.
In summary, the products of the breakdown of sugar using oxygen are energy, water, and carbon dioxide.