B) Glycolysis involves the oxidation of NADH to produce NAD.
Explanation:
Glycolysis is the common step of aerobic and anaerobic respiration. It includes splitting of a glucose molecule into two molecules of pyruvate. During the redox reactions of glycolysis, NAD+ serves as an electron acceptor.
Reduction of NAD+ during glycolytic reactions produces NADH which in turn is oxidized back through oxidative phosphorylation in aerobic respiration.
The entry of one glucose molecule into glycolysis and its splitting into pyruvate uses a total of 2 molecules of NAD+ as the electron acceptor and produces 2 molecules of NADH.
