Which Observational Fact Leads Scientists to the Conclusion That the Particles

Multiple Choice

Which observational fact leads scientists to the conclusion that the particles making up Saturn's rings are ice or ice-covered rocks?

A) high albedo, or reflectivity, of the ring material
B) distribution of their sizes; water ice is only strong enough to form the objects of the sizes detected in the rings
C) spectrum of the reflected light, which shows features unique to water ice
D) thin layer of haze above and below the rings originating from evaporated water vapor