The correct answer is (d). Oxygen is not a greenhouse gas.
Greenhouse gases are gases that trap heat in the atmosphere, causing the planet to warm. The main greenhouse gases are water vapor, carbon dioxide, methane, nitrous oxide, and ozone.
Water vapor is the most abundant greenhouse gas in the atmosphere, but it is not the most important. Carbon dioxide is the most important greenhouse gas because it is the most abundant gas that is not water vapor. Methane is the second most important greenhouse gas. Nitrous oxide and ozone are also greenhouse gases, but they are less important than water vapor, carbon dioxide, and methane.
Oxygen is not a greenhouse gas because it does not trap heat in the atmosphere. Oxygen is a gas that is essential for life. It is the gas that animals breathe in and plants release into the atmosphere.