A soil transported by water is

Options

A. clay
B. red soil
C. colluvial
D. alluvial

Answer

To solve the question "A soil transported by water is," we need to analyze the options provided and identify which type of soil is specifically associated with water transport.

### Step-by-Step Solution:

1. **Understanding Soil Transport Mechanisms**:
- Soil can be transported by various natural forces, including water, wind, and gravity. In this case, we are focusing on soil that is moved by water.

2. **Analyzing the Options**:
- **Option 1: Clay**: This is a type of soil that can be found in various environments but is not specifically defined by being transported by water.
- **Option 2: Red Soil**: This soil type is characterized by its reddish color due to iron content and is not specifically associated with water transport.
- **Option 3: Colluvial**: This type of soil is typically formed from the accumulation of materials that have moved down a slope due to gravity, not water.
- **Option 4: Alluvial**: This soil is formed from sediments deposited by rivers and streams. It is specifically known for being transported by water.

3. **Identifying the Correct Answer**:
- Among the options, **Alluvial soil** is the only type that is explicitly transported and deposited by water. It is formed from the sediments carried by rivers and streams, making it the correct answer.

4. **Conclusion**:
- Therefore, the answer to the question "A soil transported by water is" is **Alluvial soil**.

### Final Answer:
**Alluvial soil**