Two moles of a certain ideal gas at a temperature 300 K were cooled isochorically so that the gas pressure is reduced $\mathrm{\eta }$(= 2) times. The gas is expanded isobarically afterwards till its temperature got back to original value. The total amount of heat absorbed by gas in this process is:

• A

  2000 J

• B

  2500 J

• C

  3000 J

• D

  4000 J