Two Identical Planets Orbit a Star in Concentric Circular Orbits

Multiple Choice

Two identical planets orbit a star in concentric circular orbits in the star's equatorial plane. Of the two, the planet that is farther from the star must have

A) the smaller period.
B) the greater period.
C) the smaller gravitational mass.
D) the larger gravitational mass.
E) the larger universal gravitational constant.