The plot of osmotic pressure ($\pi$) vs concentration ($C$ in ${\text{mol L}}^{-1}$) for a solution gives a straight line with slope $25.73{\text{L bar mol}}^{-1}$. The temperature at which the measurement is done is:(Use $R=0.083{\text{L bar mol}}^{-1}{\text{K}}^{-1}$)

1. A
   $310^{\circ }\text{C}$
2. B
   $25.73^{\circ }\text{C}$
3. C
   $12.05^{\circ }\text{C}$
4. D
   $37^{\circ }\text{C}$