I think the correct answer would be the third option. The criteria that could help Linda in classifying whether the gases are greenhouse gases would be gas molecules having at least one oxygen atom. Most of the greenhouse gases has an oxygen atom in their structures especially those that naturally occurs. These gases are CO2, H2O vapor and nitrous oxide.
The primary greenhouse gases found in the earth atmosphere includes water vapor (H₂O), carbon dioxide (CO₂) carbon monoxide (CO), nitrous oxides (NO) and ozone (O₃) all of these gases consists of oxygen. All these gases are responsible for greenhouse effect, increasing the global temperature and melting of the glaciers.
The carbon monoxide, water vapor and nitrous oxide are oxides of a single oxygen are very potent pollutants and greenhouse gases.
