Answer:
D) ATP Synthase (Hopefully that was an option, I'm not sure if option D intentionally left out the P)
Explanation:
ATP synthase is responsible for synthesizing ATP through the phosphorylation of ADP. This is the result of mechanical energy being generated by the proton motive force (H+ ions moving into the matrix). The asymmetrical rod changes the affinity for ATP, ADP, and inorganic phosphates of each subunit in the F1 subunit, allowing ATP to be produced/prepped/released. In all, this enzyme is very important in the entire process of oxidative phosphorylation.