A body of mass m is placed on earth surface which is taken from earth surface to a height of h = 3R then change in gravitational potential energy is : -

Question

( A ) $\frac{2}{3}mgR$
( B ) $\frac{mgR}{2}$
( C ) $\frac{mgR}{4}$
( D ) $\frac{3}{4}mgR$