Consider the following statements :
Roasting is carried out to:
1. convert sulphide into oxide
2. melt the ore
3. remove moisture, water of hydration and expel organic matter
4. remove sulphur and arsenic in the form of volatile oxides
Out of these statements:

ROASTING 

The removal of the excess sulphur contained in sulphide ores by heating in an excess of air is called roasting. The concentrated sulphide ore is heated in reverberatory furnace, below its melting point or fusion temperature in the presence of an excess of air with or without the addition of an external substance. 

In roasting definite chemical like oxidation, chlorination etc. take place but in calcination does not occur any major chemical changes.

Advantages of Roasting :

(i) Excess of sulphur is removed as volatile oxide. 

(ii) The metal sulphide is converted into metal oxide and sulphate. 

(iii) Impurities of arsenic and antimony are removed as their volatile oxides.

Hence , option A is correct .