When copper ore is mixed with silica in a reverberatory furnace,copper matte is produced. The copper matte contains . . . . . .

• A
  Sulphides of copper $(II)$ and iron $(II)$
• B
  Sulphides of copper $(II)$ and iron $(III)$
• C
  Sulphides of copper $(I)$ and iron $(II)$
• D
  Sulphides of copper $(I)$ and iron $(III)$