Which one of the following is correct

Options

A. A mineral connot be an ore
B. An ore cannot be a mineral
C. All minerals are ores
D. All ore are minerals

Explanation

To determine which statement is correct regarding minerals and ores, let's analyze the definitions and relationships between the two:

1. **Understanding Minerals and Ores**:
- **Minerals**: Naturally occurring substances with a defined chemical composition and structure. They can be useful or non-useful.
- **Ores**: Specific types of minerals that contain sufficient metal or valuable elements that can be extracted profitably.

2. **Analyzing the Statements**:
- **Statement 1**: "A mineral cannot be an ore."
- This is incorrect because some minerals can indeed be classified as ores if they contain valuable metals.
- **Statement 2**: "An ore cannot be a mineral."
- This is also incorrect because ores are a subset of minerals.
- **Statement 3**: "All minerals are ores."
- This statement is incorrect. Not all minerals are ores; some are not economically viable for extraction.
- **Statement 4**: "All ores are minerals."
- This statement is correct because all ores are indeed minerals that can be extracted for their valuable components.

3. **Conclusion**:
- The correct answer is that **all ores are minerals**.

### Final Answer:
The correct statement is: **All ores are minerals.**