Two isolated spherical planets have the same gravitational potential at their surfaces. Which ratio must also be the same for the two planets?

A. $\frac{{{\rm{radiu}}{{\rm{s}}^{\rm{3}}}}}{{{\rm{mass}}}}$

B. $\frac{{{\rm{radiu}}{{\rm{s}}^{\rm{2}}}}}{{{\rm{mass}}}}$

C. $\frac{{{\rm{radius}}}}{{{\rm{mass}}}}$

D. radius

C