Assertion: The driver in a vechile moving with a constant speed on a straight road is in a non-inertial frame of reference.
Reason: A reference frame in which Newton's law of motion are applicable is non-inertial.

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion.
B. If both assertion and reason are truw but reason is not 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 need to analyze both the assertion and the reason provided.

### Step 1: Understand the Assertion
The assertion states that "the driver in a vehicle moving with a constant speed on a straight road is in a non-inertial frame of reference."

- A vehicle moving with a constant speed on a straight road means that there is no acceleration involved. The driver is experiencing no change in velocity.

### Step 2: Determine the Nature of the Frame of Reference
In physics, an inertial frame of reference is one where Newton's laws of motion hold true, and it is characterized by the absence of acceleration.

- Since the vehicle is moving with a constant speed and in a straight line, this scenario represents an inertial frame of reference.

### Step 3: Analyze the Reason
The reason states that "a reference frame in which Newton's laws of motion are applicable is non-inertial."

- This statement is incorrect. In fact, Newton's laws of motion are applicable in inertial frames, not non-inertial frames. Non-inertial frames are those that are accelerating or rotating, where fictitious forces may need to be considered.

### Step 4: Conclusion
Based on the analysis:
- The assertion is **true** because the driver is in an inertial frame of reference.
- The reason is **false** because Newton's laws apply in inertial frames, not non-inertial frames.

### Final Answer
Thus, the correct conclusion is that the assertion is true and the reason is false.