Peat, obtained from Sphagnum moss, is used as

Options

A. fuel
B. manure
C. corrosive
D. both a and b.

Explanation

### Step-by-Step Solution:

1. **Understanding Peat**: Peat is an accumulation of decayed plant material, primarily found in wetland areas such as swamps and bogs. It is dark brown in color.

2. **Source of Peat**: The peat we are discussing is specifically obtained from Sphagnum moss, which grows in these wetland environments.

3. **Formation of Peat**: When Sphagnum moss accumulates and undergoes decomposition over time, it transforms into peat. This process involves the drying of the moss and the accumulation of organic matter.

4. **Uses of Peat**:
- **As Manure**: Due to its high organic matter content, peat is beneficial for soil health and can be used as a natural fertilizer or manure in agriculture.
- **As Fuel**: Over time, peat undergoes carbonization, making it a potential source of fuel.

5. **Evaluating Options**:
- **Option A (Fuel)**: Correct, as peat can be used as a fuel source.
- **Option B (Manure)**: Correct, as peat serves as a natural fertilizer.
- **Option C (Corrosive)**: Incorrect, peat does not have corrosive properties.
- **Option D (Both A and B)**: Correct, since peat can be used both as fuel and manure.

6. **Conclusion**: The correct answer is Option D, as peat obtained from Sphagnum moss can be utilized both as a fuel and as manure.