Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.
Assertion A: Earth has atmosphere whereas moon doesn’t have any atmosphere
Reason R: The escape velocity on moon is very small as compared to that on earth.
In the light of the above statements, choose the correct answer from the options given below:

Options

A. Both A and R are correct but R is NOT the correct explanation of A
B. A is false but R is true
C. Both A and R are correct and R is the correct explanation of A
D. A is true but R is false

Answer

To solve the given question, we need to analyze both the Assertion (A) and the Reason (R) provided.

### Step-by-Step Solution:

1. **Understanding Assertion A**:
- The assertion states that "Earth has an atmosphere whereas the Moon doesn’t have any atmosphere."
- This statement is true. Earth has a significant atmosphere composed of various gases, while the Moon has a very thin exosphere, which is not considered a true atmosphere.

2. **Understanding Reason R**:
- The reason states that "The escape velocity on the Moon is very small as compared to that on Earth."
- This statement is also true. The escape velocity on Earth is approximately 11.2 km/s, while on the Moon, it is about 2.4 km/s. This significant difference in escape velocity is due to the Moon's smaller mass and radius.

3. **Analyzing the Relationship**:
- The assertion is true, and the reason is true as well. However, we need to determine if the reason correctly explains the assertion.
- The reason indicates that the small escape velocity on the Moon is the reason for the lack of a substantial atmosphere. This is indeed a correct explanation because a low escape velocity means that lighter gases can escape into space more easily, preventing the Moon from retaining a significant atmosphere.

4. **Conclusion**:
- Both the assertion (A) and reason (R) are true, and R is the correct explanation of A.

### Final Answer:
Both A and R are true, and R is the correct explanation of A.