The final electron acceptor in aerobic respiration is:

a. water

b. carbon dioxide

c. oxygen

d. NAD and FAD

The correct answer will be option-C.

Explanation:

Cellular respiration is a slow process which oxidizes food to form energy molecules like ATP. The process proceeds in four steps: Glycolysis, pyruvate decarboxylation, citric acid cycle and electron transport chain.

During the electron transport chain, the electrons from the reducing equivalents like NADH and FADH₂. The electrons move downhill by electron acceptors which gets reduced and lose the energy. The electron is finally accepted by an oxygen molecule which forms metabolic water after reacting with free hydrogen atoms.

Thus, Option-C is the correct answer.