Which Characteristic of Jupiter's Satellite Io Makes It Different from Any

Multiple Choice

Which characteristic of Jupiter's satellite Io makes it different from any other known satellite in the solar system?

A) Io has a permanent, dense atmosphere.
B) Io is volcanically active, with gas plumes and lava flows.
C) Io has geyserlike plumes of nitrogen gas.
D) Io's surface is broken into heavily cratered and lightly cratered regions in a pattern similar to plate tectonics.