The value of acceleration due to gravity at a depth $d$ from the surface of the Earth and at an altitude $h$ from the surface of the Earth are in the ratio:
- A$1: 1$
- B$\frac{R-2 h}{R-d}$
- C$\frac{R-d}{R-2 h}$
- D$\frac{R-d}{R-h}$
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