The molar specific heats of an ideal gas at constant pressure and volume are denoted by $C_p$ and $C_v$, respectively. If $\gamma = \frac{C_p}{C_v}$ and R is the universal gas constant, then $C_v$ is equal to -

Question

( A ) $\frac{1 + \gamma}{1- \gamma}$
( B ) $\frac{R}{(\gamma - 1)}$
( C ) $\frac{(\gamma - 1)}{R}$
( D ) $\gamma R$