Match List I with List II and select the correct answer using the codes given below the Lists

(Greenhouse Gases) | (M ajor Source)
A. Carbon | 1. Enteric fermentation in cattle dioxide
B. Methane | 2. Burning of fossil
C. Chlorofluoro | 3. Mercury compounds carbons in waste water
D. Nitrous oxide | 4. Nylon production
| 5. Air-conditioners and refrigeration units

The correct answer is Option 1 (A-2, B-1, C-5, D-4). This matching accurately aligns each greenhouse gas with its primary anthropogenic or biological source:

• Carbon dioxide (A-2): The combustion of fossil fuels (coal, oil, and gas) for energy and transport is the largest contributor to global CO2 emissions.
• Methane (B-1): Enteric fermentation in the digestive systems of ruminant livestock (like cattle) is a significant biological source of methane globally.
• Chlorofluorocarbons (C-5): CFCs are synthetic compounds historically used as coolants in air-conditioners and refrigeration units before being phased out by the Montreal Protocol.
• Nitrous oxide (D-4): Industrial processes, specifically the production of nylon and nitric acid, are major sources of N2O, alongside agricultural fertilizers.

Option 1 is correct because it correctly identifies these specific industrial and biological links. Other options are incorrect as they misattribute sources, such as linking CO2 to enteric fermentation or methane to fossil fuel burning in a primary capacity within this specific list context.