GKFix MCQ Question

Which of the following is an example of a displacement reaction?

• A. 2H₂ + O₂ → 2H₂O
• B. CaCO₃ → CaO + CO₂
• C. AgNO₃ + NaCl → AgCl + NaNO₃
• D. Fe + CuSO₄ → FeSO₄ + Cu