Choose the correct option using the code regarding roasting process: (A) It is the process of he...

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Choose the correct option using the code regarding roasting process:
(A) It is the process of heating the ore in air in a reverberatory furnace to obtain the oxide.
(B) It is an exothermic process.
(C) It is used for the concentration of sulphide ore.
(D) It removes easily oxidisable violatile impurifies present in the concentration ore.
(a) A, B and C
(b) A, B and D
(c) A, C and D
(d) A, B, C and D
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