Which of the following indicates a primary path by which electrons travel downhill energetically during aerobic respiration? Oglucose glycolysis -- citric acid cycle -- NADH -- ATP Oglucose - NADH -- clectron transport chain - Oxygen glucose - glycolysis - electron transport chain - NADH - ATP O glucose - pyruvate-acetyl CoA - ATP - Oxygen O glucose-citric acid cycle - ATP - NAD Find.