The correct statement is :

Options

A. Sound and light both require medium for propagation
B. Sound can travel in vacuum, but light can not
C. Sound needs medium, but light does not need medium for its propagation
D. Sound and light both can travel in vacuum.

Explanation

### Step-by-Step Solution:

1. **Understanding the Nature of Sound and Light:**
- Sound is a mechanical wave that requires a medium (solid, liquid, or gas) to propagate. It is classified as a longitudinal wave.
- Light, on the other hand, is an electromagnetic wave that does not require a medium to travel. It can propagate through a vacuum.

2. **Analyzing the Statements:**
- **Option 1:** Claims that both sound and light require a medium for propagation. This is incorrect because sound requires a medium while light does not.
- **Option 2:** States that sound can travel in a vacuum. This is also incorrect since sound cannot propagate in a vacuum.
- **Option 3:** Asserts that sound needs a medium but light does not need a medium for its propagation. This statement is correct.
- **Option 4:** Suggests that both light and sound can travel in a vacuum. This is incorrect because only light can travel in a vacuum, while sound cannot.

3. **Conclusion:**
- After analyzing all the options, the correct statement is **Option 3**, which accurately reflects the propagation requirements of sound and light.

### Final Answer:
The correct statement is: **Option 3 - Sound needs a medium but light does not need a medium for its propagation.**

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