What Is the Half-Reaction for the Oxidation of Sulfide Ions

Multiple Choice

What is the half-reaction for the oxidation of sulfide ions in aqueous solution?

A) S^2-(aq) S(s) + 2 e^-
B) S-(aq) + e^- S^2-(aq)
C) S(s) + 2 e^- S^2-(aq)
D) SO₃^2-(aq) + 6 H⁺(aq) S(s) + 3 H₂O( ) + 4 e^-
E) SO₄^2-(aq) + 8 H⁺(aq) S(s) + 4 H₂O( ) + 6 e^-