Calculate the Limiting Molar Conductivity of Sodium Chloride, NaCl, from the Following

Calculate the limiting molar conductivity of sodium chloride, NaCl, from the following measurements of molar conductivity at various concentrations. The data refer to a temperature of 298 K.
$\begin{array}{lcccc}c / \mathrm{mol} \mathrm{dm}^{-3} & 0.010 & 0.020 & 0.050 & 0.100 \\\Lambda_{\mathrm{m}} / \mathrm{S} \mathrm{m}{ }^{-1}\left(\mathrm{~mol} \mathrm{dm}^{-3}\right) ^{-1} & 117.45 & 115.70 & 111.01 & 106.69\end{array}$

A) 122.6 S m^-1 (mol dm^-3) ^-1
B) 106.9 S m^-1 (mol dm^-3)
C) 119.3 S m^-1 (mol dm^-3) ^-1
D) 96.3 S m^-1 (mol dm^-3) ^-1