Which of the following best explains why β-oxidation of fatty acids cannot efficiently occur under anaerobic conditions?

• A. Fatty acids require oxygen to be transported into the mitochondria.
• B. Oxygen is needed to regenerate NAD⁺ and FAD, which are essential for β oxidation.
• C. β-oxidation produces water as a byproduct, which requires oxygen.
• D. Fatty acids can only be oxidized in the presence of glucose.

Answer: (B)