The correct answer is (d). Hydrogen 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, but it is not the most important. Carbon dioxide is the most important greenhouse gas because it is the most abundant human-caused greenhouse gas. Methane is the second most important human-caused greenhouse gas. Nitrous oxide is the third most important human-caused greenhouse gas. Ozone is a greenhouse gas in the stratosphere, but it is not a greenhouse gas in the troposphere.
Hydrogen is not a greenhouse gas because it does not absorb or emit infrared radiation.