Discussion
The gases responsible for green-house effect resulting in global warming are :
Answer: C
The answer is Methane and Carbon dioxide.
Both absorb outgoing infrared radiation from the Earth's surface and re-emit part of it downward, which warms the lower atmosphere. Carbon dioxide is the largest human-added contributor, and methane is about 80 times more powerful per molecule over 20 years.
Nitrogen and oxygen, the main gases of air, absorb almost no infrared, so the first two options fail even though ozone is a minor greenhouse gas. Ammonia is not a significant greenhouse gas. Carbon monoxide is an indirect contributor at most, through its effect on methane, and it is not one of the gases 'responsible' in the standard list.
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