Assertion : It is hotter over the top of a fire than at the same distacne of the side.
Reason : Air surrounding the fire conducts more heat upward

Options

A. If both Assertion and Reason are correct and Reason is also a good absorber of radiation at a given wavelength.
B. If both Assertion and Reason are correct 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 question, we need to analyze both the assertion and the reason provided.

### Step-by-Step Solution:

1. **Understanding the Assertion**:
- The assertion states that it is hotter over the top of a fire than at the same distance on the side.
- This can be explained by the principle of convection. When a fire burns, it heats the air above it. The hot air, being less dense, rises, creating a convection current. Therefore, the temperature above the fire is higher compared to the same distance to the side.

2. **Understanding the Reason**:
- The reason given is that the air surrounding the fire conducts more heat upward.
- While it is true that hot air rises, the statement implies that conduction is the primary mechanism for heat transfer in this scenario. However, air is a poor conductor of heat. The primary mode of heat transfer in this case is convection, not conduction.

3. **Evaluating the Truth of Assertion and Reason**:
- Both the assertion and the reason are true. The assertion correctly describes the temperature difference due to convection, and the reason correctly notes that hot air rises.
- However, the reason does not accurately explain the assertion because it attributes the temperature difference to conduction rather than convection.

4. **Conclusion**:
- Since both the assertion and the reason are true, but the reason does not correctly explain the assertion, we conclude that the assertion is true and the reason is true, but the reason is not the correct explanation of the assertion.

### Final Answer:
Both the assertion and the reason are true, but the reason is not the correct explanation of the assertion.