Which of the following statements is incorrect?

Which of the following statements is incorrect?
A In ETC (Electron Transport Chain), one molecule of NADH + $H^+$ gives rise to 2 ATP molecules, and one $FADH_2$ gives rise to 3 ATP molecules.
B ATP is synthesized through complex V.
C Oxidation - reduction reactions produce proton gradient in respiration.
D During aerobic respiration, role of oxygen is limited to the terminal stage.

Electron Transport System and Oxidative Phosphorylation in past papers

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Practise Electron Transport System and Oxidative Phosphorylation All 3 questions This chapter in 2021