Greenhouse gases absorb radiation from the:

Eliminate incorrect options: Greenhouse gases do not absorb radiation directly from the Sun before it reaches Earth, as the Sun primarily emits visible light and ultraviolet radiation, which pass through the atmosphere. Similarly, the Moon does not emit radiation relevant to this process, and the ozone layer primarily absorbs ultraviolet radiation, not infrared radiation.

Focus on the correct process: The correct answer is that greenhouse gases absorb radiation emitted by Earth's surface, which is in the form of infrared radiation.