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

1. A
   $128{\text{S cm}}^2{\text{mol}}^{-1}$
2. B
   $302{\text{S cm}}^2{\text{mol}}^{-1}$
3. C
   $278{\text{S cm}}^2{\text{mol}}^{-1}$
4. D
   $176{\text{S cm}}^2{\text{mol}}^{-1}$