Consider the Reaction of Iodine with Manganese Dioxide 3I₂(s)

Consider the reaction of iodine with manganese dioxide 3I₂(s) + 2MnO₂(s) + 8OH⁻(aq) ⇄ 6I⁻(aq) + 2MnO₄(aq) + 4H₂O(l)
The equilibrium constant for the overall reaction is 8.30 × 10⁻⁷. Calculate ΔG° for the reaction at 25°C.

A) −15.1 kJ
B) −34.7 kJ
C) 15.1 kJ
D) 34.7 kJ
E) None of these choices are correct.