At Least Some Archaeans Are Called "Extremophiles" Because

At least some Archaeans are called "extremophiles" because

A) as a group, they are extremely diverse.
B) as a group, they occupy an extremely large number of environments.
C) where they occur, they occur in extremely large numbers.
D) they can live in environments where abiotic conditions are extreme--extremely hot, extremely salty, extremely toxic, for example.
E) All of the above.