Answer:
C) All of the above
Explanation:
To answer this question, let's examine each alternative.
a) [Planetary rings] orbit in the equatorial plane of their planet. (True).
Considering the equatorial plane as the plane that divides it into two halves, Moreover to that the fact that by the word equatorial, it is meant hemisphere. So the ring describes an elliptical orbit by the equatorial plane, according to Kepler Laws.
b) [Planetary rings] are composed of a large number of individual particles that orbit their planet in accord with Kepler's laws. (True)
Each ring orbiting Saturn, Uranus, Neptune, and Jupiter is made up of rock, ice, moonlets, small parts of moons and other particles. And they orbit their planets at a certain speed. And their orbits describe an elliptical shape with their planets as foci, just like Kepler law described.
