Which of the following ore can be subject to roasting?

Options

A. Galena
B. Cinnabar
C. Copper pyrite
D. all these

Explanation

To determine which ore can be subjected to roasting, we need to understand the process of roasting and identify the ores that are suitable for this process.

### Step-by-Step Solution:

1. **Understand the Process of Roasting**:
- Roasting is a thermal treatment process where ores, particularly sulphide ores, are heated in the presence of air. This process converts sulphide ores into their corresponding oxides.

2. **Identify Sulphide Ores**:
- The key to determining which ores can be roasted is to identify those that are sulphide ores. Common examples of sulphide ores include:
- Galena (PbS)
- Cinnabar (HgS)
- Copper Pyrite (CuFeS2)

3. **Assess the Given Options**:
- If the question provides a list of ores, check if any of them are sulphide ores. If they are, they can undergo the roasting process.

4. **Conclusion**:
- Based on the understanding of roasting and the identification of sulphide ores, any ore listed that is a sulphide can be subjected to roasting.