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If the rms velocity of a perfect gas at $27^{\circ} C$ is $500 \,m \cdot s^{-1}$,the same at $927^{\circ} C$ will be
- A$5000 \,m \cdot s^{-1}$
- B$2000 \,m \cdot s^{-1}$
- C$1000 \,m \cdot s^{-1}$
- D$3000 \,m \cdot s^{-1}$
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