One mole of an ideal gas is contained within a cylinder by a frictionless piston and is initially at temperature $T$. The pressure of the gas is kept constant while it is heated and its volume doubles. If $R$ is the molar gas constant,the work done by the gas in increasing its volume is
- A$RT \ln 2$
- B$1/2 \, RT$
- C$RT$
- D$3/2 \, RT$
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