The change in potential energy, when a body of mass m is raised to a height nR from the earth's surface is (R = Radius of earth) [MP PMT 1996]

• A.             \[mgR\frac{n}{n-1}\]
• B.               nmgR
• C.             \[mgR\frac{{{n}^{2}}}{{{n}^{2}}+1}\]
• D.               \[mgR\frac{n}{n+1}\]