The ease of adsorption of the hydrated alkali metal ions on an ion-exchange resins follows the order :

Question

( A ) $Li^{+}$<$K^+$<$Na{+}$<$Rb^{+}$ <br/> ( B ) $Na^{+}$<$Li^+$<$K^{+}$<$Rb^{+}$ <br/> ( C ) $RB^{+}$<$K^+$<$Na^{+}$<$Li^{+}$ <br/> ( D ) $K^{+}$<$Na^+$<$RB^{+}$<$Li^{+}$</span>