Assertion : Path of a particle in SHM is always a straight line.
Reason : All straight line motions are not simple harmonic.

Options

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

Explanation

To analyze the assertion and reason provided in the question, we will break down each part step by step.

### Step 1: Understanding the Assertion
The assertion states that the path of a particle in Simple Harmonic Motion (SHM) is always a straight line.

**Evaluation**: This statement is incorrect. While some SHM can occur along a straight line (like a mass on a spring moving back and forth), many systems exhibit SHM in a circular path, such as a pendulum swinging back and forth. The motion of a pendulum is a classic example of SHM that does not follow a straight line.

### Step 2: Understanding the Reason
The reason states that all straight line motions are not simple harmonic.

**Evaluation**: This statement is correct. For example, a car moving in a straight line at constant speed is not undergoing periodic motion, and thus it does not qualify as SHM. SHM requires a restoring force that is proportional to the displacement from the equilibrium position, which is not the case for all straight-line motions.

### Step 3: Conclusion
Based on the evaluations:
- The assertion is **incorrect** because SHM does not always follow a straight line.
- The reason is **correct** because not all straight-line motions are periodic or simple harmonic.

Thus, we conclude that the assertion is incorrect while the reason is correct.

### Final Answer
Assertion: Incorrect
Reason: Correct