The work done in slowly lifting a body from earth's surface to a height R (radius of earth) is equal to two times the work done in lifing the same body from earth's surface to height h there h is equal to

Question

$$(a)\;\frac{R}{4} \quad (b)\;\frac{R}{3} \quad (c)\;\frac{R}{6} \quad (d)\;\frac{R}{2}$$