Which of the following is the overall reaction of rusting?

• A. 2Fe(s) → 2Fe2+ + 4e–
• B. O2 (g)+4H+(aq)+4e–⟶2H2O(l)
• C. 2Fe(s) + O2(g) + 4H+(aq) → 2Fe2+(aq) + 2H2O(l)
• D. H2O ⇌ H+ + OH–