What Peculiar Feature Accompanies Io in Its Orbit Around Jupiter

Multiple Choice

What peculiar feature accompanies Io in its orbit around Jupiter?

A) torus or ring of ionized sulfur and oxygen atoms and electrons
B) cometlike tail of rocks and dust, shining by reflected sunlight
C) narrow ring of rocks and dust, Jupiter's ring, at about Io's orbital distance
D) auroral storm in the magnetosphere that always keeps pace with Io