Which of the Following Best Describes the Fumaroles That Exist

Multiple Choice

Which of the following best describes the fumaroles that exist in Yellowstone National Park?

A) Hot springs so hot that they create steam and vent sulfuric acid
B) Lava deposits that are constantly heated from superheated gases in the ground below.
C) Smoke from lava pits below ground that vent to the surface through cracks.
D) Lakes that are heated by underground pyroclastic flows.