During Fermentation Yeast Produce Ethanol,a Toxic Waste Product

During fermentation yeast produce ethanol,a toxic waste product.Why would yeast produce something that is toxic to themselves?

A) To produce NADH for energy
B) To regenerate NAD⁺ in order to continue glycolysis
C) To use up excess pyruvate in order to continue glycolysis
D) To conserve oxygen for other reactions
E) To avoid the production of lactic acid