________ when burnt, gives the smell of burning paper.

Options

A. Nylon
B. Rayon
C. Jute
D. Cotton

Explanation

To solve the question "________ when burnt, gives the smell of burning paper," we need to identify which material among the given options produces a smell similar to that of burning paper when it is burnt.

### Step-by-Step Solution:

1. **Understanding the Options**:
- The options provided are likely to include synthetic, semi-synthetic, and natural fibers. Common examples include nylon, rayon, jute, and cotton.

2. **Identifying the Nature of Each Fiber**:
- **Nylon**: This is a synthetic fiber, which means it is man-made and does not have a natural origin.
- **Rayon**: This is a semi-synthetic fiber, derived from natural sources but processed chemically.
- **Jute**: This is a natural fiber, derived from the jute plant.
- **Cotton**: This is also a natural fiber, derived from the cotton plant.

3. **Analyzing the Smell of Burning**:
- When natural fibers like jute and cotton are burnt, they tend to produce a smell similar to that of burning paper because paper is also made from natural fibers (like wood pulp from trees).
- Synthetic fibers like nylon do not produce this smell, as they are made from petrochemicals.

4. **Comparing Jute and Cotton**:
- While both jute and cotton are natural fibers, the smell of burning jute is not as similar to burning paper compared to cotton.
- Cotton, when burnt, gives off a smell that closely resembles that of burning paper.

5. **Conclusion**:
- Therefore, the answer to the question is **cotton**.

### Final Answer:
Cotton when burnt, gives the smell of burning paper.

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