Archaea have been found in many microenvironments in the human body. Which of the following microenvironments is most likely to fit with the designation of Archaea as "extremophiles?"

A) The gingiva and the gut are anaerobic.
B) The inner ear can withstand increased pressure.
C) The temperature of the testes is less than 37°C.
D) The surface of the tongue has salt receptors.