The correct order of reduction potentials of the following pairs is

$\text{A. }{\mathrm{Cl}}_2/{\mathrm{Cl}}^{-}$

$\text{B. }{\mathrm{I}}_2/I^{ -}$

$\text{C. }{\mathrm{Ag}}^{+}/\mathrm{Ag}$

$\text{D .}{\mathrm{Na}}^{+}/\mathrm{Na}$

$\text{E. }{\mathrm{Li}}^{+}/Li$

Choose the correct answer from the options given below.