An open vessel at $27\,^{\circ}C$ is heated until two-fifths of the air (assumed as an ideal gas) in it has escaped from the vessel. Assuming that the volume of the vessel remains constant,the temperature to which the vessel has been heated is:
- A$500\,^{\circ}C$
- B$750\,^{\circ}C$
- C$500\,K$
- D$750\,K$
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