Choose the correct alternative and write it along with its allotted alphabet :
In the usual notation, the acceleration due to gravity at a height h from the surface of the earth is.....

Options

A. g=frac{GM}{R+h}
B. g=frac{GM}sqrt{R+h}
C. g=frac{GM}{(R+h)^2}
D. g=GM(R+h)^2