Which of the following processes is associated with the smelting stage?

  • A
    $Al_2O_3 \cdot 2H_2O \to Al_2O_3 + 2H_2O$
  • B
    $Fe_2O_3 + 3C \to 2Fe + 3CO$
  • C
    $ZnCO_3 \to ZnO + CO_2$
  • D
    $2PbS + 3O_2 \to 2PbO + 2SO_2$

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