At $27\,^{\circ}C$ and $1\,atm$ pressure,the density of a gas is $d$. At what temperature will its density become $0.75d$ if the pressure is kept constant?
- A$20\,^{\circ}C$
- B$30\,^{\circ}C$
- C$400\,K$
- D$300\,K$
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