For the redox reaction,
${\mathrm{Cr}}_2{\mathrm{O}}_7^{2-}+{\mathrm{SO}}_3^{2-}+{\mathrm{H}}^{+}\to {\mathrm{Cr}}^{3+}+{\mathrm{SO}}_4^{2-}+{\mathrm{H}}_2\mathrm{O}$
The coefficients of the reactants for the balanced equation are 

	${\mathrm{Cr}}_2{\mathrm{O}}_7^{2-}$	${\mathrm{SO}}_3^{2-}$	H+
(1)	1	3	8
(2)	2	3	14
(3)	1	4	14
(4)	1	3	12