One of the Kirkwood Gaps in the Asteroid Belt Is

One of the Kirkwood gaps in the asteroid belt is described as "3/7 of Jupiter''s orbital period.".What does this mean?

A) This location corresponds to the radius where an asteroid would complete three solar orbits in the same time Jupiter completes seven solar orbits.
B) This location corresponds to the radius where an asteroid would complete seven solar orbits in the same time Jupiter completes three solar orbits.
C) This location corresponds to a radius which that is 3/7 of the orbital radius of Jupiter.
D) The asteroids are apparently the remnants of material which never formed into a larger body. If that body had orbited at this location, it would have had 3/7 of Jupiter''s mass.