The change in the value of $$g$$ at a height '$$h$$' above the surface of the earth is the same as at a depth '$$d$$' below the surface of earth. When both '$$d$$' and '$$h$$' are much smaller than the radius of earth, then which one of the following is correct?

A

$$d = \frac{h}{2}$$

B

$$d = \frac{3h}{2}$$

C

$$d = 2h$$

D

$$d = h$$