During strenous exercise, the NADH formed in the glyceraldehyde-3-phosphate dehydrogenase reaction in skeletal muscle must be reoxidized to NAD if glycolysis is to continue. The most important reaction involved in the reoxidation of NADH is: A. dihydroxyacetone phosphate
->
glycerol-3-phosphate B. glucose-6-phosphate
->
fructose-6-phosphate C. isocitrate
->
--ketoglutarate D. glucose
->
glucose-6-phosphate E. pyruvate
->
lactate