If $R$ is the radius of the Earth and $g$ is the acceleration due to gravity on the Earth's surface,then the mean density of the Earth is:
- A$\frac{4 \pi G}{3 g R}$
- B$\frac{3 \pi R}{4 g G}$
- C$\frac{3 g}{4 \pi R G}$
- D$\frac{\pi R G}{12 g}$
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