The correct order of the mobility of the alkali metal ions in aqueous solution is:

Question

( A ) $K^{+} > Rb^{+} > Na^{+} > Li^{+}$
( B ) $Na^{+} > K^{+} > Rb^{+} > Li^{+}$
( C ) $Rb^{+}>K^{+}>Na^{+}>Li^{+}$
( D ) $Li^{+} > Na^{+} > K^{+} > Rb^{+}$