No. of gasses qualify as a greenhouse gases: \[CO,NO,N{O_2},C{l_2},{H_2},Ne\]:

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Hint: At first think about the definition of greenhouse gases. A greenhouse gas is a gas that absorbs and emits radiant energy within the thermal infrared range. Greenhouse gases cause the greenhouse effect on planets.

Complete step by step answer:
The greenhouse effect is the process that occurs when gases in Earth’s atmosphere trap the sun’s heat. It makes the earth much warmer than it would be without the atmosphere. It makes the earth a comfortable place to live.
Coming to global warming it occurs when there is a gradual increase in the earth’s overall temperature caused by the increased levels of carbon dioxide and other pollutants.
The primary greenhouse gases in the earth’s atmosphere are water vapour, carbon dioxide, methane, nitrous oxide, and ozone. Carbon monoxide has a very slight effect on global warming as it is a weak greenhouse gas.
In nitrogen oxides the nitric acid and nitrogen dioxide act as indirect greenhouse gases by producing the tropospheric greenhouse gas “ozone” by photochemical reactions in the atmosphere. They decrease the lifetimes of methane gas.
$C{l_2},{H_2},Ne$ are not at all responsible for the greenhouse effect or global warming. But Chlorofluorocarbon($CFC$) is a gaseous compound made of three elements: carbon, fluorine, chlorine. In the olden days, it was used as a cleansing agent in air conditioners, refrigerators, etc. But due to $CFCs$, there is major damage that is the depletion of the ozone layer that has started by then the $CFCs$ are not in usage.
So the greenhouse gases are 3, they are $CO, NO, N{O_2}$. The answer is B.

Human activities are changing the earth’s natural greenhouse effect. Like burning fossil fuels into the atmosphere which cause global warming. We took a major part in destroying the earth’s atmosphere. We are also responsible for global warming so try to take part in growing plants and stop deforestation.