The Ring of Material That Surrounds Jupiter Appears to Be

The ring of material that surrounds Jupiter appears to be made up of:

A) pure ice crystals, similar to those in high cirrus clouds on Earth.
B) extremely fine dust particles, about the size of smoke particles, of average diameter 0.001 mm.
C) gas vapor of individual molecules of hydrogen sulfide and sulfur dioxide from Io's volcanoes.
D) icy, reflective rocks, averaging about 1 cm in diameter but with wide variation in size.