Assertion : The formation of ozone hole is mainly observed in the stratosphere over Antarctic.
Reason Polar stratospheric cloud formed over Antarctica helps in the depletion of Ozone hole.

Options

A. If both Assertion and Reason are CORRECT and Reason in the CORRECT and Reason is the CORRECT explanation of the Assertion.
B. If both Assertion and Reason are CORRECT but Reason is not the CORRECT explanation of the Assertion .
C. If Assertion is CORRECT but Reason is INCORRECT .
D. If Assertion is INCORRECT but Reason is CORRECT

Answer

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 formation of the ozone hole is mainly observed in the stratosphere over Antarctica.
- This is true because the ozone hole phenomenon is primarily noted during the Southern Hemisphere's spring (September to November) when the conditions in the stratosphere over Antarctica are most conducive to ozone depletion.

**Hint**: Recall where the ozone layer is located and the specific regions where the ozone hole is most prevalent.

2. **Understanding the Reason**:
- The reason states that polar stratospheric clouds (PSCs) formed over Antarctica help in the depletion of the ozone hole.
- This is also true. PSCs provide a surface for chemical reactions that lead to the release of chlorine and bromine compounds, which are responsible for ozone depletion.

**Hint**: Consider the role of polar stratospheric clouds in the chemical reactions that lead to ozone depletion.

3. **Connecting Assertion and Reason**:
- Now, we need to determine if the reason correctly explains the assertion.
- Since the formation of the ozone hole is indeed facilitated by the presence of polar stratospheric clouds, which promote the chemical reactions leading to ozone depletion, the reason is a correct explanation for the assertion.

**Hint**: Think about how one statement supports or explains the other.

4. **Conclusion**:
- Both the assertion and the reason are correct, and the reason is the correct explanation of the assertion. Therefore, the answer is that both statements are true, and the reason is a correct explanation for the assertion.

**Final Answer**: A (Both assertion and reason are correct, and the reason is the correct explanation of the assertion).