Answer is C .. Hopes this help a lot ;)
ATP is broken down to ADP and Pi when energy is required to carry out the metabolic process. ATP is also released during the metabolic process.
<u>Explanation:</u>
The pumping of hydrogen ions across the inner membrane creates concentration gradient where there is higher concentration of the ions in the intermembrane space than in the matrix. This chemiosmotic gradient causes the ions to flow back across the membrane into the matrix, where their concentration is lower.
ATP synthase behaves as a channel protein thereby helping the hydrogen ions cross the membrane. It also has the ability to act as an enzyme, forming ATP from ADP and inorganic phosphate.
After passing through the electron transport chain, the used electrons joins with oxygen to form water. That is why oxygen is required. In the absence of oxygen, this process will not occur.
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