The image above was taken by the Galileo spacecraft as it visited the asteroid belt on its way to Jupiter. Shown in the image are two rocky-iron bodies. The large object on the left is an asteroid named Ida. The object on the right, which measures only about 1 mile across, is named Dactyl. Dactyl is a tiny moon that orbits the asteroid Ida. Dactyl orbits Ida due to

A.
the magnetic force field that defines the asteroid belt.

B.
electrical energy transferred between the two objects.

C.
the mutual gravitational attraction between the two objects.

D.
small differences in the objects' rocky-iron compositions.