The correct option is
B Utilises proton energy
In ETC, during the passage of two electrons from one electron carrier to another, energy is liberated to pump three pairs of protons out of the inner chamber of mitochondria. For protons to flow back inside, they have to pass through the F0-F
1 particles of oxysome in which F
1 has ATP synthase. So F
1 particle utilises proton energy as it passes to produce ATP.
So the answer is 'Utilises proton energy'.