$A$ spherical planet has a mass $M$ and diameter $D$. $A$ particle of mass $m$ falling freely near the surface of this planet will experience an acceleration due to gravity equal to:
- A$\frac{4GM}{D^2}$
- B$\frac{GM}{D^2}$
- C$\frac{GMm}{D^2}$
- D$\frac{4GMm}{D^2}$
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