Which of the Following Is NOT a Potential Reason Anoxic

Which of the following is NOT a potential reason anoxic methane-oxidizing Archaea have not also acquired the ability to reduce sulfate?

A) An individual electron acceptor such as sulfate is not always present where methane is.
B) Minimizing the metabolic requirements of the archaeon's genome size provides flexibility to interact with other reducing bacteria, such as nitrate reducers.
C) The archaeon-bacterium relationship yields more energy from methane oxidation/sulfate reduction when performed together than separately.
D) The methane-oxidizing Archaea will not easily acquire this metabolic capability from the bacterial partner.