Three identical satellites X, Y, and Z move in separate circular orbits of radii R, 2R, and 3R, respectively, around the same planet. Listed from most negative to least negative, which sequence correctly orders their total mechanical energies EX, EY, and EZ?
(a) EZ,EY,EX
(b) EY,EX,EZ
(c) EX,EY,EZ
(d) EX,EZ,EY