The conversion of pyruvate into lactic acid during fermentation requires the presence of NADH. The correct option would be A.
During fermentation, two pyruvate molecules are converted to lactic acid with the help of NADH. The equation is as follows:
[tex]Pyruvic acid + NADH <---> lactic acid + NAD+[/tex]
Fermentation occur in the cells of mammals when the shortage of oxygen does not allow pyruvate molecules to move into the citric acid cycle during respiration. Thus the pyruvate molecules are converted to lactic acid instead to generate a small amount of ATP for the cells.
More on lactic acid fermentation can be found here: https://brainly.com/question/2095032
