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Inside an active mitochondrion, most electrons follow which pathway?

a. glycolysis, NADH, oxidative phosphorylation, ATP, oxygen
b. citric acid cycle, FADH2, electron transport chain, ATP
c. electron transport chain, citric acid cycle, ATP, oxygen
d. pyruvate, citric acid cycle, ATP, NADH, oxygen
e. citric acid cycle, NADH, electron transport chain, oxygen