Which statement about the energy source for ATP synthesis in oxidative phosphorylation is correct?

Which statement about the energy source for ATP synthesis in oxidative phosphorylation is correct?

• A. The proton motive force created by the electron transport chain drives ATP synthase to form ATP.
• B. Direct transfer of electrons to ADP forms ATP.
• C. Substrate-level phosphorylation occurs in the cytosol during oxidative phosphorylation.
• D. Light energy energizes ATP in mitochondria.

Answer: (A)