[A]: During evolution of Primates, various groups diverged in a particular sequence from the main line of descent.
[R]: Prosimians (Tarsiers, lemurs) which diverged first, are most distantly related to humans and most closely related to original primates.

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 solve the question regarding the evolution of primates and the relationship between prosimians and humans, we can break down the information into a step-by-step analysis.

### Step-by-Step Solution:

1. **Understanding the Assertion (A)**:
- The assertion states that during the evolution of primates, various groups diverged in a particular sequence from the main line of descent. This implies that there is a common ancestor from which different primate groups evolved.

**Hint**: Think about the concept of a common ancestor and how species can diverge from it over time.

2. **Analyzing the Reason (R)**:
- The reason provided states that prosimians (like tarsiers and lemurs) diverged first and are most distantly related to humans while being closely related to original primates. This suggests a phylogenetic relationship where prosimians are an early branch of primates.

**Hint**: Consider the evolutionary tree and how different branches represent the divergence of species over time.

3. **Evaluating the Relationship**:
- Both the assertion and reason are true statements. The assertion correctly describes the divergence of primates from a common ancestor, and the reason accurately reflects the relationship between prosimians and humans.

**Hint**: Compare the two statements to see if they directly support each other or if they discuss different aspects of primate evolution.

4. **Determining the Connection**:
- While both statements are true, the reason does not provide a direct explanation for the assertion. The assertion discusses the overall evolution of primates, while the reason focuses specifically on the relationship between prosimians and humans.

**Hint**: Identify if the reason clarifies or supports the assertion or if it is simply related information.

5. **Conclusion**:
- Since both A and R are true but R does not explain A, the correct answer is that both statements are true, but R is not a correct explanation for A.

**Final Answer**: The correct option is that both A and R are true, but R is not a correct explanation for A.