Concept:Greenhouse gases trap heat in Earth's atmosphere by absorbing and re-emitting infrared radiation, keeping the planet warm.Explanation:Among the given options, carbon dioxide is a well‑known greenhouse gas. It absorbs a large portion of the Earth's outgoing thermal radiation. Nitrogen, argon, and oxygen are not greenhouse gases because their molecular structures do not allow them to absorb infrared radiation effectively. Greenhouse gases include carbon dioxide, methane, water vapour, nitrous oxide, and ozone. In the list, only carbon dioxide fits this category.
Answer:The correct option is Carbon dioxide (option B).
