Oxygen and sugar are used in the process that provides energy to cells; water and carbon dioxide are its waste products. Water and sugar are used to in the process that provides energy to cells; oxygen and carbon dioxide are its waste products. Oxygen and carbon dioxide are used in the process that provides energy to cells; sugar and water are its waste products. Carbon dioxide and sugar are used in the process that provides energy to cells; water and oxygen are its waste products.
I gave my students this multiple choice question: Which statement best describes the process of respiration?

Only one answer is correct among these 4 choices:
- Oxygen and sugar are used in the process that provides energy to cells; water and carbon dioxide are its waste products.
- Water and sugar are used to in the process that provides energy to cells; oxygen and carbon dioxide are its waste products.
- Oxygen and carbon dioxide are used in the process that provides energy to cells; sugar and water are its waste products.
- Carbon dioxide and sugar are used in the process that provides energy to cells; water and oxygen are its waste products.

Could you tell me which one is correct?

Oxygen and sugar are used in the process that provides energy to cells; water and carbon dioxide are its waste products.