Which of the Following Earth-Bound Phenomena Do "Volcanoes" on Io,the

Multiple Choice

Which of the following Earth-bound phenomena do "volcanoes" on Io,the innermost Galilean moon of Jupiter,most resemble in behavior?

A) Undersea volcanoes,where hot lava produces explosive boiling of the water
B) Mountain volcanoes such as Mount St.Helens,exhibiting rare but devastating explosions that throw material high into the atmosphere
C) Lava-flow volcanoes occurring on the tops of mountains,such as those on Hawaii
D) Regularly spouting geysers in relatively flat hot-springs areas