Which of the following electronic configuration will have maximum I.P. difference between II and III I.P. :

Question

$\begin{array}{1 1} ( A ) 1s^{2} 2s^{2} 2p^{6} 3s^{2} \\( B ) 1s^{2} 2s^{2} 2p^{6 } 3s^{1}\\ ( C ) 1s^{2} 2s^{2} 2p^{5} \\( D ) 1s^{2 } 2s^{2} 2p^{6} \end{array}$