The Kirkwood Gaps Are Primarily Caused By

The Kirkwood gaps are primarily caused by:

A) the gravitational tug of Jupiter nudging asteroids into new orbits.
B) shepherd satellites controlling the orbits of ring particles.
C) orbits of material being disturbed because Jupiter's gravitational field balances the Sun at this distance, and objects can escape from the solar system.
D) large asteroids sweeping parts of the asteroid belt clear of smaller asteroids.