Most common and commerical water pollutant is
Industrial waste ; Fertilizers ; Detergents ; PCB's

Options

A. Industrial waste
B. Fertilizers
C. Detergents
D. PCB's

Answer

To determine the most common and commercial water pollutant from the given options, we can analyze each option step by step:

### Step 1: Analyze the Options
We have four options to consider:
1. Industrial waste
2. Fertilizers
3. Detergents
4. PCBs (Polychlorinated Biphenyls)

### Step 2: Evaluate Industrial Waste
Industrial waste is generated from various industries and often contains harmful chemicals, heavy metals (like mercury and cadmium), and oils. Industries frequently discharge their waste into water bodies without adequate treatment, leading to significant water pollution. This waste is not only common but also commercial, as it comes from profit-driven industries.

### Step 3: Evaluate Fertilizers
Fertilizers are primarily used in agriculture. While they can contribute to water pollution through runoff, their impact is generally less severe compared to industrial waste. Fertilizers do not pollute water bodies in large quantities as frequently as industrial waste does.

### Step 4: Evaluate Detergents
Detergents are household products that can enter water systems through sewage. They contribute to water pollution but are not as significant a source as industrial waste. Their presence in water bodies is more localized and less frequent on a large scale.

### Step 5: Evaluate PCBs
PCBs are synthetic organic chemicals that can be harmful to the environment. However, their use has been largely banned or restricted in many countries. While they are pollutants, they are not as commonly found in large quantities as industrial waste.

### Conclusion
After evaluating all options, it is clear that **industrial waste** is the most common and commercial water pollutant. It is generated in large quantities by various industries and has a significant detrimental effect on water quality and aquatic life.

### Final Answer
**Industrial Waste**

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