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Which of the following reactions represents a reduction process?.
- A.A) Zn → Zn²⁺ + 2e⁻
- B.B) Cu²⁺ + 2e⁻ → Cu
- C.C) 2H₂ + O₂ → 2H₂O
- D.D) 2Fe³⁺ + 3Zn → 2Fe + 3Zn²⁺
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