Why Is Pyruvate Reduced During Fermentation

Why is pyruvate reduced during fermentation?

A) to regenerate NAD⁺, permitting glycolysis to continue
B) to produce additional NADH, which can be oxidized in electron transport
C) to produce additional ATP by coupling ATP production to the reduction of pyruvate. The now reduced form of pyruvate can then enter the Krebs Cycle.
D) Pyruvate is toxic to cells. It is therefore reduced to a non-toxic form.