Which of the following best explains about the usefulness of the production of ethanol in yeas… Show more Which of the following best explains about the usefulness of the production of ethanol in yeast cells under anaerobic conditions? A. Ethanol keeps the electron transport system functioning B. Yeast would be unable to activate the enzymes of the Krebs cycle without ethanol C. The process generates oxygen, which is required for glycolysis D. The process regenerates NAD + , which is required for glycolysis • Show less