Which of the following reactions is NOT a Redox Reaction?

• A. Cu(s) + 2Ag⁺ (aq) → Cu²⁺ (aq) + 2 Ag (s)
• B. 2Na(s) + Cl₂ (g) → 2 NaCl (s)
• C. K₃P (s) + 2 O₂ (g) → K₃PO₄ (s)
• D. Pb(NO₃)₂ (aq) + Na₂SO₄ (aq) → PbSO₄ (s) + 2 NaNO₃ (aq)

Answer: (D)