Saturn's Rings Are Much Brighter Than the Rings of the Other

Multiple Choice

Saturn's rings are much brighter than the rings of the other giant planets because

A) Saturn is closer to the Sun and receives a higher flux of sunlight.
B) the material in Saturn's rings is made mostly of ice rather than rock.
C) Saturn's rings have over 100 times the density of other ring systems.
D) Saturn's rings are tilted by a larger angle relative to our line of sight.
E) the material in Saturn's rings is much hotter than material in other ring systems.