Answer: Option D) fermentation
In yeasts and certain other microbes going through fermentation, pyruvate is turned into ethyl alcohol (ethanol).
Step-by-step explanation:
Under anaerobic conditions (in the absence of oxygen), organisms such as yeast and microorganisms convert pyruvate (the end product of glycolysis) into ethanol and carbon dioxide ( CO2 ).
Thus, the process of turning pyruvate to alcohol is known as alcoholic fermentation.