The correct answer is A. Infrared wavelengths.
The Earth emits radiation with greatest intensity at infrared wavelengths because of its temperature. The Earth’s surface temperature is about 288 K, which is in the infrared part of the electromagnetic spectrum. The peak of the Earth’s emission spectrum is at about 10 micrometers, which is in the mid-infrared range.
Radio waves have longer wavelengths than infrared waves, and ultraviolet waves have shorter wavelengths. The Earth does emit some radiation at these wavelengths, but the intensity is much lower than at infrared wavelengths.
Visible light has wavelengths in the range of 380 to 700 nanometers. The Earth does emit some visible light, but the intensity is very low. This is because the Earth’s atmosphere absorbs most of the visible light that is emitted by the Sun.
In conclusion, the Earth emits radiation with greatest intensity at infrared wavelengths. This is because the Earth’s surface temperature is about 288 K, which is in the infrared part of the electromagnetic spectrum.