(D) The reactivity of alkali metals with water increases as we move down the group in the periodic table. The order of reactivity is $Li < Na < K < Rb

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(D) The reactivity of alkali metals with water increases as we move down the group in the periodic table. The order of reactivity is $Li < Na < K < Rb < Cs$. Therefore,$Rb$ (Rubidium) has a higher reaction rate with water compared to $Li$,$Na$,and $K$.