No. of gasses qualify as a greenhouse gases: $CO,NO,N{O_2},C{l_2},{H_2},Ne$:A.$2$B.$3$C.$4$D.$1$

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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.

$C{l_2},{H_2},Ne$ 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.