Which one of the following statements best explains why NADH fuels more ATP production (2.5ATP/NADH) than does FADH2 (1.5 ATP/FADH2)a. NADH deposits its electrons into complex I, which pumps 4 protons per electron pair, whereas FADH2 deposits its electrons into complex II, which pumps no protons.b. More free energy is released when FADH2 passes its electron pair to O2 compared to NADHc. NADH has a more negative reduction potential (E) than does FADH2d. options a and ce. options b and c