During alcohol fermentation, pyruvate undergoes decarboxylation to form acetaldehyde. What happens next in the process?

• A. Acetaldehyde is used to regenerate ATP.
• B. Acetaldehyde is oxidized to form lactate.
• C. Acetaldehyde is reduced by NADH to form ethanol.
• D. Acetaldehyde is converted back to pyruvate.

Answer: (C)