ANS:D - absorbed

When radiation is absorbed by a material or a surface, its energy is taken in by the material and converted into other forms, such as heat. Absorption occurs when the electromagnetic waves of the radiation interact with the atoms or molecules of the material, causing them to absorb the energy carried by the radiation. In the context of a black body, absorption means that all incident radiation, regardless of its wavelength or direction, is absorbed by the surface of the black body. This absorption is ideal and complete, meaning that no radiation is reflected, transmitted, or refracted; instead, all of it is converted into thermal energy within the black body. This property is what gives black bodies their characteristic appearance of absorbing all light that falls upon them.