What is the order of relative degree of hydration for alkali metal ions?

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