Assertion : Minerals are naturally occurring chemical substances in the earth’s crust obtainable by mining.
Reason : Minerals are also known as ores.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion .
B. if both assertion and reason are true but reason is not the correct explanation of assertion
C. If assertion is true but reason is false
D. If both assertion and reason are false.

Explanation

To solve the question, we need to analyze the assertion and the reason provided, determining their correctness.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that "Minerals are naturally occurring chemical substances in the earth’s crust obtainable by mining."
- This statement is true. Minerals are indeed naturally occurring substances found in the earth's crust, and they can be extracted through mining processes.

2. **Understanding the Reason**:
- The reason states that "Minerals are also known as ores."
- This statement is incorrect. While all ores are minerals, not all minerals qualify as ores. Ores are specific types of minerals that can be extracted profitably and economically.

3. **Conclusion**:
- Since the assertion is true and the reason is false, we can conclude that the correct relationship is that the assertion is correct, but the reason is not.

4. **Final Answer**:
- Therefore, the correct response to the question is that the assertion is true and the reason is false.