From following molar conductivities at infinite dilution $\Lambda_m^{\large\circ}$ for $Ba(OH)_2=457.6\Omega^{-1}cm^2mol^{-1}$,$\Lambda_m^{\large\circ}$ for $BaCl_2=240.6\Omega^{-1}cm^2mol^{-1}$,$\Lambda_m^{\large\circ}$ for $NH_4Cl=129.8\Omega^{-1}cm^2mol^{-1}$.The $\Lambda_m^{\large\circ}$ for $NH_4OH$ is

Question

$\begin{array}{1 1}(a)\;238.3\Omega^{-1}cm^2mol^{-1}&(b)\;262.3\Omega^{-1}cm^2mol^{-1}\\(c)\;289\Omega^{-1}cm^2mol^{-1}&(d)\;242\Omega^{-1}cm^2mol^{-1}\end{array}$