Answer: A. Energy
The major products of fermentation are lactic acid, ethanol, hydrogen gas, and carbon dioxide. Fermentation involves the breaking down of substances containing sugar substances using chemical means which sometimes involves microorganisms with the release of heat. The end products always include alcohol and carbon dioxide. The foaming seen in the production of wine and beer is a form of fermentation and it is a process that takes close to 10,000 years. Fermentation destroys a couple of harmful microbes and replaces them with beneficial bacteria.