Which of the Following Is not True of the Rings

Multiple Choice

Which of the following is not true of the rings of Saturn

A) They are mostly very thin, forming a large planar disk.
B) They are comprised of various sized objects ranging from dust to moon- size objects.
C) The faintest outer rings are closely associated with the moon Enceladus.
D) They are remnants of the formation of the planet and have not changed over time.