Which of the following represents a single displacement reaction?

• A. C + O₂ → CO₂
• B. Zn + CuSO₄ → ZnSO₄ + Cu
• C. NaCl + AgNO₃ → NaNO₃ + AgCl
• D. 2 H₂ + O₂ → 2 H₂O

Answer: (B)