The depth $d$ at which the acceleration due to gravity becomes $\frac{g}{n}$ is (where $R$ is the radius of the Earth,$g$ is the acceleration due to gravity at the surface,and $n$ is an integer).
- A$\frac{R(n-1)}{n}$
- B$\frac{R(n+1)}{n}$
- C$\frac{R(n-1)^2}{n}$
- D$\frac{R(n+1)^2}{n}$
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