Why Are Saturn's Rings So Thin

Why are Saturn's rings so thin?

A) Saturn's gravity prevents particles from migrating upwards out of the rings.
B) The "gap" moons shepherd the particles and maintain its thin profile.
C) Any particle in the ring with an orbital tilt would collide with other ring particles,flattening its orbit.
D) Solar radiation pressure keeps particles pressed into the rings.
E) The current thinness is a short-lived phenomenon that is special to this time.

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