Which of the following substances used in agriculture does not cause water pollution to large extent?

Options

A. Manures
B. Pesticides
C. Fertilizers
D. Insecticides

Explanation

To determine which of the substances used in agriculture does not cause water pollution to a large extent, we will analyze each option provided.

### Step-by-Step Solution:

1. **Identify the substances**: The substances mentioned are Pesticides, Fertilizers, Insecticides, and Inorganic Matter.

2. **Understand the impact of each substance**:
- **Pesticides**: These are chemicals used to kill pests. They can run off into water bodies during rain, leading to water pollution.
- **Fertilizers**: These are used to enhance soil fertility. However, excess fertilizers can leach into water bodies, causing nutrient pollution (eutrophication).
- **Insecticides**: Similar to pesticides, insecticides are designed to kill insects but can also contaminate water sources.
- **Inorganic Matter**: This refers to non-organic substances that do not decompose easily. They can accumulate in water bodies but do not contribute to pollution in the same way as the other chemicals.

3. **Evaluate the pollution potential**:
- Pesticides, fertilizers, and insecticides are all chemicals that can lead to significant water pollution through runoff and leaching.
- Inorganic matter, while it can affect water quality, does not have the same chemical impact as the other substances.

4. **Conclusion**: Among the options, **Inorganic Matter** is the substance that does not cause water pollution to a large extent compared to the others.

### Final Answer:
**Inorganic Matter**