The ratio between the values of acceleration due to gravity at a height 1 km above and at a depth of  1 km below the earth’s surface is

Q: The ratio between the values of acceleration due to gravity at a height 1 km above and at a depth of  1 km below the earth’s surface is (radius of earth is R)

(a) $\frac{R-2}{R-1}$

(b) $\frac{R}{R-1}$

(c) $\frac{R-2}{R}$

(d) $\frac{2R}{R-1}$