For water , $\Delta _{fus} H^3_m=2.74 \;kJ\;mol^{-1}$ and its molar mass is $84.2\;g \;mol^{-1}$ the normal freezing point depression constant at 1 atm pressure would be about

Question

$\begin{array}{1 1} 4.71\;K\;kg\;mol^{-1} \\ 1.2\;K\;kg\;mol^{-1} \\ 1.83\;K\;kg\;mol^{-1} \\ 2.5\;K\;kg\;mol^{-1} \end{array}$