The mass of a planet is \(M\) and its radius is \(R\). In order for a body of mass \(m\) to escape the gravitational attraction of the planet, its kinetic energy at the surface of the planet must be at least

A.     \(\frac{{GMm}}{R}\)

B.     \(\frac{{GMm}}{{{R^2}}}\)

C.     \(\frac{{GM}}{R}\)

D.     \(\frac{{GM}}{{{R^2}}}\)

A