Assertion : Most amplifiers use common emitter circuit configuration.
Reason : Its input resistance is comparatively higher.

Options

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

Explanation

To solve the question, we will analyze both the assertion and the reason provided.

### Step 1: Analyze the Assertion
The assertion states that "Most amplifiers use common emitter circuit configuration."
- The common emitter (CE) configuration is widely used in amplifiers because it provides significant voltage and current gain. It is a popular choice for audio and radio frequency applications due to its ability to amplify weak signals effectively.

**Hint**: Consider the advantages of the common emitter configuration in terms of gain.

### Step 2: Analyze the Reason
The reason states that "Its input resistance is comparatively higher."
- The input resistance of the common emitter configuration is indeed higher compared to other configurations like the common base (CB) configuration. This higher input resistance allows it to be more compatible with various input sources, making it favorable for many applications.

**Hint**: Think about how input resistance affects the performance of an amplifier.

### Step 3: Determine the Relationship Between Assertion and Reason
Now, we need to determine if the reason provided is a correct explanation of the assertion.
- The assertion is true because most amplifiers do use the common emitter configuration.
- The reason is also true, as the common emitter configuration does have a higher input resistance compared to other configurations.

However, while the reason is true, it does not fully explain why the common emitter configuration is favored in amplifiers. The main reason for its popularity is its ability to provide both current and voltage gain, resulting in a high power gain.

**Hint**: Evaluate if the reason directly supports the assertion or if there are other factors involved.

### Conclusion
Both the assertion and reason are true, but the reason does not adequately explain the assertion. Therefore, the correct answer would be that both statements are true, but the reason is not the correct explanation for the assertion.

**Final Answer**: Both the assertion and reason are true, but the reason is not the correct explanation for the assertion.