The gas which emits from rice field is A. Ethane B. Methane C. Nitrogen D. All of the above

The correct answer is B. Methane.

Methane is a greenhouse gas that is emitted from rice fields. It is produced by the decomposition of organic matter in the soil, and by the fermentation of rice plants. Methane is a potent greenhouse gas, and it is estimated that rice fields are responsible for about 10% of global methane emissions.

Ethane is another greenhouse gas, but it is not emitted from rice fields in significant amounts. Nitrogen is not a greenhouse gas, and it is not emitted from rice fields.

Here is a brief explanation of each option:

• Ethane is a hydrocarbon gas that is found in natural gas and petroleum. It is also produced by the fermentation of organic matter. Ethane is a greenhouse gas, but it is not emitted from rice fields in significant amounts.
• Methane is a hydrocarbon gas that is also found in natural gas and petroleum. It is also produced by the decomposition of organic matter and by the fermentation of rice plants. Methane is a potent greenhouse gas, and it is estimated that rice fields are responsible for about 10% of global methane emissions.
• Nitrogen is a non-flammable, odorless, and colorless gas that is the most abundant element in the Earth’s atmosphere. It is also found in
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  soil, water, and living organisms. Nitrogen is not a greenhouse gas, and it is not emitted from rice fields.