Some Bacteria Are Strict Aerobes and Others Are Strict Anaerobes

Some bacteria are strict aerobes and others are strict anaerobes.Some bacteria,however,are facultative anaerobes and can live with or without oxygen.If given the choice of using oxygen or not,which pathway should a facultative anaerobe perform?

A) Use oxygen since aerobic metabolism provides more ATP per molecule of carbohydrate than anaerobic metabolism.
B) Avoid using oxygen since anaerobic metabolism provides more ATP per molecule of carbohydrate than aerobic metabolism.
C) It doesn't matter; both processes will produce the same results.