Where Would a Scientist Most Likely Find an Archaean When

Where would a scientist most likely find an archaean when sampling carbonate hydrothermal vents?

A) at the outside base of a chimney
B) mid-way up the outside of a chimney
C) at the outside top of a chimney
D) inside the chimney beside the warm vent flow
E) inside the chimney far away from the warm vent flow