Comparing the amount of ATP synthesis from NADH and FADH2

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NADH and FADH2 are both electron carriers thatdonate their electrons to the electron transport chain. Theelectrons ultimately reduce O2 to water in the finalstep of electron transport. However, the amount of ATP made byelectrons from an NADH molecule is greater than the amount made byelectrons from an FADH2 molecule.
Which statement best explains whymore ATP is made per molecule of NADH than per molecule ofFADH2?
1. FADH2 is made only in the citric acid cyclewhile NADH is made in glycolysis, acetyl CoA formation, and thecitric acid cycle.
2. It takes more energy to make ATP from ADP and Piusing FADH2 than using NADH.
3. The H+ gradient made from electron transportusing NADH is located in a different part of the mitochondrion thanthe H+ gradient made using FADH2
4. Fewer protons are pumped across the inner mitochondrialmembrane when FADH2 is the electron donor than when NADHis the electron donor.
5. There is more NADH than FADH2 made for everyglucose that enters cellular respiration.

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