Correct option is D
Oxygen is not a greenhouse gas. Greenhouse gases, such as carbon dioxide (CO₂), methane (CH₄), and hydrochlorofluorocarbons (HCFCs), trap heat in the Earth's atmosphere, contributing to global warming. Oxygen (O₂) does not have the same heat-trapping properties.
Carbon dioxide: A significant greenhouse gas.
Methane: A potent greenhouse gas.
Hydrochlorofluorocarbons (HCFCs): Industrial chemicals that contribute to the greenhouse effect.
Oxygen: Correct, as it is not a greenhouse gas.
Therefore, the correct answer is (d) Oxygen.
