Why Does Glycolysis Have to Be Followed by Either Fermentation

Multiple Choice

Why does glycolysis have to be followed by either fermentation or respiration?

A) Because acetyl-CoA isn't completely formed until the citric acid cycle.
B) Because NAD⁺ needs to be recycled from NADH so that the glycolytic pathway can continue.
C) So that fermentation will be able to produce more ATP using the electrons from NADH.
D) So that the cell can use FADH₂ in the next step of aerobic respiration.