[单选题]
A satellite is in an orbit around a planet of radius $R$. The graph shows the variation of different energy quantities against r, which is the distance from the center of the planet. The graph origin represents the surface of the planet.
Which one of the following statements may be correct about the energies of this satellite?
]] II. B shows the variation of the total energy of the satellite.
III. C shows the variation of the sum of kinetic and potential energies of the satellite
A. Only $I$
B. $I$ and $II$ only
C. $II$ and $III$ only
D. $I$, $II$, and $III$
