Sun gives out UV, infrared and visible radiation gets received by the earth. The incoming solar energy from the sun is redirected back towards space by the atmosphere and clouds and then some of the solar energy gets absorbed by the atmosphere and clouds. And the remaining energy gets absorbed by the Earth’s surface making it warm. This energy then gets converted into heat.
Now once this heat gets absorbed by the earth’s surface, it is trapped in the earth’s atmosphere and thereby adding to increase the earth’s temperature. This effect is what we call the ‘Greenhouse Effect’.
Thus, Infrared rays are the cause of the Greenhouse effect.
Hence, the correct option is A