Question $4(1$ point$)$

$Cl{O}_3^{-}+3H_{2}O+3S{O}_2-3S{O}_4^{2-}+C{l}^{-}+6H^{+}$

Complete the following statement:

is undergoing reduction and

is the reducing

agent

$S$ in $S{O}_2$;$H_{2}O$

$H$ in $H_{2}O$;$S{O}_2$

$S$ in $S{O}_2$;$Cl{O}_3^{-}$

$Cl$ in $Cl{O}_3^{-}$;$H_{2}O$

$Cl$ in $Cl{O}_3^{-}$;$S{O}_2$