Which of the following is a redox reaction?
- A$NaCl + KNO_3 \to NaNO_3 + KCl$
- B$CaC_2O_4 + 2HCl \to CaCl_2 + H_2C_2O_4$
- C$Mg(OH)_2 + 2NH_4Cl \to MgCl_2 + 2NH_4OH$
- D$Zn + 2AgCN \to 2Ag + Zn(CN)_2$
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