If $M$ is the mass of a planet and $R$ is its radius,then in order to become a black hole (where $c$ is the speed of light),which condition must be satisfied?
- A$\sqrt{\frac{G M}{R}} \leq c$
- B$\sqrt{\frac{G M}{2 R}} \geq c$
- C$\sqrt{\frac{2 G M}{R}} \geq c$
- D$\sqrt{\frac{2 G M}{R}} \leq c$
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