Kirkwood Gaps in the Asteroid Belt Occur at Distances Where

Multiple Choice

Kirkwood gaps in the asteroid belt occur at distances where

A) the orbit would take the asteroid beyond the "frost line" in the solar system.
B) the period of an orbiting asteroid would be the same as Jupiter's orbital period.
C) the density of asteroids is high enough for a large collision to pulverize a number of asteroids.
D) the period of an orbiting asteroid would be the same as Mars's orbital period.
E) the period of an orbiting asteroid would be a simple fraction (like 1/3 or 1/4) of Jupiter's orbital period.