23. The Krebs cycle runs__? (A) six times for each glucose, because each carbon pulled from the original molecule will power the Krebs cycle；(B) 12 times for each glucose, because all of these processes are associated with the Krebs cycle；(C) three times for each glucose, to power the electron transport proteins in hydrogen transport；(D) twice for each glucose, acting on the two-carbon molecule fragments from glycolysis, carried as acetyl CoA.