The equivalent conductance of Nacl at concentration C and at infinite dilution are $\;\lambda_{C}\;$ and $\;\lambda_{\infty}\;$,respectively .The correct relationship between $\;\lambda_{C}\;$ and $\;\lambda_{\infty}\;$ is given as : (Where the constant B is positive)

Question

$(a)\;\lambda_{C}=\lambda_{\infty}+(B)C\qquad(b)\;\lambda_{C}=\lambda_{\infty}-(B)C\qquad(c)\;\lambda_{C}=\lambda_{\infty}-(B)\sqrt{C}\qquad(d)\;\lambda_{C}=\lambda_{\infty}+(B)\sqrt{C}$