The Physical Mechanism That Is Thought to Control the Motion

Multiple Choice

The physical mechanism that is thought to control the motion and position of material in the narrow F ring around Saturn is the

A) effect of the planet's intense magnetic field on the material.
B) confining gravitational interaction between this material and two shepherd satellites.
C) effect of sunlight focused on this material by the planet's atmosphere.
D) complex gravitational interaction between the major moons of Saturn and the F ring material.