Which species are the oxidizing and reducing agents in the following reaction?

\[{\text{SO}}_3^{2 - }{\text{(aq)}} + {\text{Pb}}{{\text{O}}_2}{\text{(s)}} + {{\text{H}}_2}{\text{O(l)}} \to {\text{SO}}_4^{2 - }{\text{(aq)}} + {\text{Pb(OH}}{{\text{)}}_2}{\text{(s)}}\]

D