Coal is ........... in nature:

Options

A. soft
B. hard
C. thin
D. hot

Explanation

To answer the question "Coal is ........... in nature," we need to determine the correct adjective that describes the nature of coal from the given options: soft, hard, thin.

### Step-by-Step Solution:

1. **Understanding Coal**:
- Coal is a fossil fuel that is primarily composed of carbon. It is formed from the remains of ancient plants that have undergone heat and pressure over millions of years.

2. **Analyzing the Options**:
- **Soft**: This option suggests that coal is not very dense or hard. However, coal is known to be quite dense and solid.
- **Hard**: This option indicates that coal has a solid and firm structure. Given its formation process, coal is indeed hard.
- **Thin**: This option implies that coal has a slim or narrow structure. Coal can come in various shapes and sizes, but it is not typically described as thin.

3. **Evaluating the Nature of Coal**:
- Coal is generally recognized for its black color and hard texture. It does not fit the description of being soft or thin.

4. **Conclusion**:
- Based on the analysis of the options, the correct answer is that coal is **hard** in nature.

### Final Answer:
Coal is **hard** in nature.