Correct!

ATP synthase can produce ATP using as a direct energy source:

A. energy from the conversion of glucose to pyruvate

B. energy from the oxidation of pyruvate producing CO₂ and H₂0

C. energy from a proton gradient established in mitochondria

The electrons from from NADH and FADH₂ flow through the electron transport chain in the inner mitochondrial membrane generating a H+ buildup in the inner membrane space. This proton gradient (gradient of H+) flowing through the membrane enzyme complex ATP synthetase is the direct energy source for producing ATP.

D. energy derived from the breakdown of NADH and FADH₂

E. energy from the metabolism of amino acids