Which of the following reactions will have the largest equilibrium constant (K) at 298 K?
A. 2 Hg(g) + O₂(g) → 2 HgO(s) ΔG° = -180.8 kJ
B. CaCO₃(s) → CaO(s) + CO₂(g) ΔG° =+131.1 kJ
C. 3O₂(g) → 2 O₃(g) ΔG° = +326 kJ
D. Fe₂O₃(s) + 3 CO(g) → 2 Fe(s) + 3 CO₂(g) ΔG° = -28.0 kJ