Mach column I with column II and select the correct answer from the given codes.
`{:(ColumnI, Column II),(A."Methanogens",(i)BOD),(B."Fermentors",(ii)"Methane rich fuel gas"),(C."Organic waste in water",(iii)"Production of methane"),(D."Biogas",(iv)"Large vessels for growing microbes"):}`

Options

A. `A-(ii),B-(iv),C-(iii),D-(i)`
B. `A-(iv),B-(iii),C-(ii),D-(i)`
C. `A-(ii),B-(i),C-(iv),D-(iii)`
D. `A-(iii),B-(iv),C-(i),D-(ii)`

Answer

To solve the matching question between Column I and Column II, we will analyze each item in Column I and find its corresponding match in Column II.

### Step-by-Step Solution:

1. **Identify Methanogens (A)**:
- Methanogens are microorganisms that produce methane as a metabolic by-product.
- From Column II, the correct match for Methanogens is **(iii) Production of methane**.
- **Match**: A - (iii)

2. **Identify Fermentors (B)**:
- Fermentors are large vessels or containers where fermentation occurs, allowing for the growth of microbes.
- From Column II, the correct match for Fermentors is **(iv) Large vessels for growing microbes**.
- **Match**: B - (iv)

3. **Identify Organic Waste in Water (C)**:
- Organic waste in water is measured by BOD (Biochemical Oxygen Demand), which indicates the amount of dissolved oxygen needed to break down organic matter.
- From Column II, the correct match for Organic waste in water is **(i) BOD**.
- **Match**: C - (i)

4. **Identify Biogas (D)**:
- Biogas is a biofuel produced from the breakdown of organic matter and is rich in methane.
- From Column II, the correct match for Biogas is **(ii) Methane rich fuel gas**.
- **Match**: D - (ii)

### Final Matches:
- A - (iii) Production of methane
- B - (iv) Large vessels for growing microbes
- C - (i) BOD
- D - (ii) Methane rich fuel gas

### Conclusion:
The correct answer from the given codes is:
- **Option D**: A - (iii), B - (iv), C - (i), D - (ii)

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