An ideal gas expands isothermally along $ab$ and does $600\,J$ of work. During the process,

  • A
    the heat rejected by the gas to the surroundings is $600\,J$
  • B
    the heat absorbed by the gas from the surrounding is $600\,J$
  • C
    no heat exchange between gas and its surroundings takes place
  • D
    the heat absorbed by the gas is less than $600\,J$

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