The limiting molar conductivities $\bigwedge^{\circ}$ for $NaCl,\;KBr$ and $KCl$ are $126, \;152$ and $150\; S\; cm^2 \; mol^{-1}$ respectively. The $\bigwedge^{\circ}$ for $NaBr$ is

Question

( A ) $278\; S\;cm^2\; mol^{-1}$
( B ) $302\; S\;cm^2\; mol^{-1}$
( C ) $176\; S\;cm^2\; mol^{-1}$
( D ) $128\; S\;cm^2\; mol^{-1}$