For the redox reaction

$Mn{O}_4^{-}+C_2{O}_4^{2-}+H^{+}\underset{}{\overset{}{\to }}M{n}^{2+}+C{O}_2+H_{2}O$

the correct coefficients of the reactants for the balanced reaction are:

               $Mn{O}_4^{-}$            $C_2{O}_4^{2-}$         $H^{+}$

                  2                      5                16

                 16                     5                2

                  5                     16               2

                  2                     16                5