Which of the following best describes the mechanism of the greenhouse effect in earth’s atmosphere?

Sunlight passes through the atmosphere and warms the earth, which then radiates energy back as long wave infrared. Greenhouse gases such as carbon dioxide, methane and water vapour absorb this outgoing infrared and re-radiate it, warming the lower atmosphere. Hence 'Infrared radiation from earth’s surface is absorbed by gases in the atmosphere' describes the mechanism.