Helium gas has undertaken a process in which the pressure and the volume are changed according to the equation $P=kV^2$. If $C_v$ is the molar specific heat at constant volume, then the molar hear capacity of the gas for the process is given by?

Question

$(A) C = C_v + R/2$ $(B) C = C_v + R/4$ $(C) C = C_v + R/3$ $(D) C = C_v - R/2$