Which of the following reactions is the metal displacement reaction? Choose the right option.

1. A. Cr2O3 + 2Al ->[ ] Al2O3 + 2Cr
2. B. Fe + 2HCl -> FeCl2 + H2
3. C. 2Pb(NO3)2 -> 2PbO + 4NO2 + O2
4. D. 2KClO3 ->[ ] 2KCl + 3O2

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