Assuming that respiration and fermentation occur at the same time, which ... ...

Assuming that respiration and fermentation occur at the same time, which of the following statements is true about this experiment?
(A) Since respiration yields more ATP per glucose molecule than fermentation does, the net amount of ATP produced by respiration must be greater than that produced by fermentation.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in 04. Cellular Metabolism