The three boxes in this diagram represent the three major biosynthetic pathways in aerobic respiration. Arrows represent net reactants or products. Arrows numbered 4, 8 and 12 can all be

Pathway A: Glycolysis; Pathway B: Krebs cycle; Pathway C: Terminal oxidationStep 1: Any of the intermediate of glycolysis other than glucoseStep 2: Pyruvic acidStep 3: NADHStep 4: ATPStep 5: Acetyl CoA from fatty acids or amino acidsStep 6: NADH/ FADH2 Step 7: FADH2/ NADHStep 8: ATPStep 9: NADH/ FADH2 (other than Glycolysis and Krebs cycle)Step 10: FADH2/ NADH (other than Glycolysis and Krebs cycle)Step 11: H2OStep 12: ATP