C. an anaerobic process that converts sugar into energy and lactic acid is the byproduct

Answer 1

The process you're describing is known as lactic acid fermentation. In lactic acid fermentation, glucose (a type of sugar) is broken down by bacteria or muscle cells in the absence of oxygen (anaerobically) to produce energy. The main byproducts of this process are lactic acid and energy in the form of ATP (adenosine triphosphate). This process is commonly used in some food production, such as yogurt and sauerkraut, and occurs in human muscle cells during intense exercise when oxygen is scarce.