challenge: Which of the following archaeal species are known to be aerobic?
  
  A. Thermococcus, Pyrococcus, Methanobrevibacter
  B. Haiobacterium, Thermoplasma, Sulfolobus
  C. Halobacterium, Thermococcus, Pyrococcus
  D. Methanobrevibacter, Methanosarcina, Pyrolobus
  Answer: 