Assertion. Death is regarded as the most regulatory process on earth.
Reason. It avoids over-crowding caused by continuous reproduction

Options

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

Answer

To analyze the assertion and reason provided in the question, we can break down the solution into the following steps:

### Step-by-Step Solution:

1. **Understanding the Assertion**: The assertion states that "Death is regarded as the most regulatory process on earth." This implies that death plays a crucial role in maintaining ecological balance.

2. **Understanding the Reason**: The reason given is that "It avoids overcrowding caused by continuous reproduction." This suggests that if organisms were to reproduce indefinitely without any deaths, it would lead to overcrowding.

3. **Linking Assertion and Reason**: We need to determine if the reason provided correctly explains the assertion. The assertion highlights the importance of death in regulating populations, while the reason explains how death prevents overcrowding due to unchecked reproduction.

4. **Evaluating the Truth of Both Statements**:
- **Assertion**: True. Death is indeed a regulatory process that helps maintain ecological balance.
- **Reason**: True. Continuous reproduction without death would lead to overcrowding, which could disrupt ecosystems.

5. **Conclusion**: Since both the assertion and the reason are true, and the reason accurately explains why death is a regulatory process, we conclude that both statements are correct and the reason is the correct explanation of the assertion.

### Final Answer:
Both the assertion and the reason are true, and the reason is the correct explanation of the assertion.