Answer: Option (C) is the correct answer.
Explanation:
When simultaneous reduction and oxidation helps in transfer of electrons from an electron donor to an electron acceptor then it forms an electron transport chain.
There is also transfer of protons along with transfer of electrons. As a result, it helps in the synthesis of adenosine triphosphate (ATP) which helps in storage of energy in the form of highly strained bonds.
Thus, we can conclude that the electron transport chain is the process which makes the most usable energy for the dog.
