Wood is a

Options

A. primary fuel
B. liquid fuel
C. processed fuel
D. secondary fuel

Answer

### Step-by-Step Solution:

1. **Understanding the Types of Fuels**:
- Fuels are categorized into different types based on their origin and processing. The main categories include primary fuels, processed fuels, and secondary fuels.

2. **Definition of Primary Fuels**:
- Primary fuels are those that are found in nature and can be used directly without undergoing any significant transformation or processing. Examples include coal, natural gas, and wood.

3. **Identifying Wood**:
- In the context of the question, we need to identify what type of fuel wood is. Wood is a natural resource that can be used directly as a fuel source for heating and cooking.

4. **Conclusion**:
- Since wood is a natural resource that can be used directly without any processing, it qualifies as a primary fuel.

5. **Final Answer**:
- Therefore, wood is classified as a primary fuel.