Given that \({\rm{E}}_{{{\rm{O}}_2}/{{\rm{H}}_2}{\rm{O}}}^ \ominus = + 1.23{\rm{\;V}}\)\({\rm{E}}_{{{\rm{S}}_2}{\rm{O}}_8^{2 - }/{\rm{SO}}_4^{2 - }}^ \ominus = 2.05{\rm{\;V}}\)\({\rm{E}}_{{\rm{B}}{{\rm{r}}_2}/{\rm{Br}}}^ \ominus = + 1.09{\rm{\;V}}\)\({\rm{E}}_{{\rm{A}}{{\rm{u}}^{3 + }}/{\rm{Au}}}^ \ominus = + 1.4{\rm{\;V}}\)The strongest oxidizing agent is:

• A. Au3+
• B. O2
• C. \({{\rm{S}}_2}{\rm{O}}_8^{2 - }\)
• D. Br2