A gas at initial temperature \( T \) undergoes sudden expansion fro...

A gas at initial temperature \( T \) undergoes sudden expansion from volume \( \mathrm{V} \) to \( 2 \mathrm{~V} \). Then
[KVPY 2016]
(a) The process is adiabatic
\( \mathrm{P} \)
(b) The process is isothermal
W
(c) The work done in this process is \( n R T \ln _{e}(2) \) where \( n \) is the number of moles of the gas
(d) The entropy in the process does not change