28. The net ATP production in glycolysis is only two because__? (A) two ATPs are used to "activate" glucose, while 4 ATPs are produced in remaining glycolysis steps；(B) two ATPs are used to donate electrons, in order to move NADH into the mitochondria；(C) None of the answer choices are correct, because six ATPs are the net yield from glycolysis；(D) that is the needed number of ATPs to power the reactions of the Krebs cycle.