Assertion: Friction can occur only between two surfaces that are moving relative to each other.
reason: Friction opposes relative motion between two surfaces in contact.

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 assertion is false but reason is true

Explanation

To solve the assertion and reason question, we need to analyze both statements carefully.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states: "Friction can occur only between two surfaces that are moving relative to each other."
- This implies that friction is only present when there is motion between the surfaces.

2. **Analyzing the Reason**:
- The reason states: "Friction opposes relative motion between two surfaces in contact."
- This means that friction acts to resist the movement of one surface over another.

3. **Evaluating the Assertion**:
- The assertion is incorrect because friction can also exist when two surfaces are at rest relative to each other. For example, if a block is resting on a surface, static friction acts on the block to prevent it from moving, even though there is no relative motion.

4. **Evaluating the Reason**:
- The reason is correct. Friction indeed acts to oppose any relative motion between two surfaces in contact. This is true for both static and kinetic friction.

5. **Conclusion**:
- Since the assertion is false and the reason is true, the correct answer is that the assertion is false, but the reason is true.

### Final Answer:
- The assertion is false, and the reason is true.