Which one of the following pollutatns causes irritation in eye?

Options

A. CO
B. `SO_(2)`
C. `NO_(2)`
D. All of these

Answer

To determine which pollutant causes irritation in the eye, we can analyze the options provided:

1. **Identify the pollutants**: The options given are:
- Option 1: CO (Carbon Monoxide)
- Option 2: SO2 (Sulfur Dioxide)
- Option 3: NO2 (Nitrogen Dioxide)
- Option 4: All of these

2. **Understand the effects of each pollutant**:
- **Carbon Monoxide (CO)**: Primarily known for its effects on the respiratory system and is not typically associated with eye irritation.
- **Sulfur Dioxide (SO2)**: This gas can cause irritation to the eyes, throat, and lungs. It is known to lead to symptoms such as redness and watering of the eyes.
- **Nitrogen Dioxide (NO2)**: This gas can also cause eye irritation along with respiratory issues. It is a significant contributor to air pollution and can lead to inflammation of the eyes.

3. **Evaluate the options**:
- Since both SO2 and NO2 are known to cause eye irritation, and CO is not typically associated with this effect, we need to consider the option that includes all pollutants.
- Option 4 states "all of these," which implies that it includes CO, SO2, and NO2.

4. **Conclusion**: Given that both SO2 and NO2 are known to cause eye irritation, and considering the context of air pollution where multiple pollutants can contribute to eye problems, the best answer is:
- **Correct option**: Option 4 (All of these).

### Final Answer:
The pollutant that causes irritation in the eye is **Option 4: All of these**.