Assertion: The flash of lightening is sees before the sound of thunder is heard.
Reason: Speed of sound is greater than speed of light.

Options

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

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 "The flash of lightning is seen before the sound of thunder is heard." This is a true statement. When lightning strikes, light travels to our eyes almost instantaneously due to its very high speed, while the sound of thunder travels much slower.

2. **Understanding the Reason**:
- The reason states that "Speed of sound is greater than speed of light." This statement is false. In reality, the speed of light in a vacuum is approximately \(3 \times 10^8\) meters per second, while the speed of sound in air is about \(343\) meters per second at room temperature. Therefore, the speed of sound is significantly less than the speed of light.

3. **Conclusion**:
- Since the assertion is true and the reason is false, we can conclude that the assertion is correct while the reason provided does not support it.

4. **Final Answer**:
- The correct option is that the assertion is true and the reason is false.