Which is the correct statement ?
A) Recoptor is the medium which is affected by the pollutant.
Sink is the medium which decreases the effect of pollutant B)
C) COD measures the organic pollution of wate

Options

A. A & B
B. B & C
C. C & A
D. A,B & C

Answer

To solve the question regarding which statement is correct about receptors, sinks, and COD (Chemical Oxygen Demand), we will analyze each statement one by one.

### Step 1: Analyze Statement A
**Statement A:** "Receptor is the medium which is affected by the pollutant."

- **Explanation:** A receptor refers to any medium (like soil, water, or organisms) that is impacted by pollutants. This statement is correct because receptors are indeed affected by pollutants.

### Step 2: Analyze Statement B
**Statement B:** "Sink is the medium which decreases the effect of pollutant."

- **Explanation:** A sink is a medium or species that interacts with pollutants, often reducing their concentration or effect in the environment. For example, carbon sinks can absorb carbon dioxide from the atmosphere. Thus, this statement is also correct.

### Step 3: Analyze Statement C
**Statement C:** "COD measures the organic pollution of water."

- **Explanation:** COD stands for Chemical Oxygen Demand, which is a measure of the amount of organic compounds in water. It indicates the level of organic pollution, making this statement true as well.

### Step 4: Conclusion
Since all three statements (A, B, and C) are correct, the correct answer is option D, which states that all the statements are true.

### Final Answer:
The correct answer is D) All statements A, B, and C are correct.

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