Examine the Following Half-Reactions and Select the Weakest Oxidizing Agent

Examine the following half-reactions and select the weakest oxidizing agent among the species listed. AuBr₄(aq) + 3e⁻ ⇄ Au(s) + 4Br⁻(aq) E° = 0.854 V
Mn²⁺(aq) + 2e⁻⇄ Mn(s) E° = −1.185 V
K⁺(aq) + e⁻⇄ K(s) E° = −2.931 V
F₂O(aq) + 2H⁺(aq) + 4e⁻⇄ 2F⁻(aq) + H₂O(l) E° = 2.153 V

A) AuBr ₄⁻( aq)
B) Mn ²⁺( aq)
C) K ⁺( aq)
D) F ₂O( aq)
E) H ⁺( aq)