Question

earths atmosphere would be best considered as a(n): a absorber of all radiation b blackbody c selective absorber d reflector of all radiation

Explanation:

Earth's atmosphere doesn't absorb all (A is wrong) or reflect all (D is wrong) radiation. A blackbody (B) absorbs all incident radiation, which the atmosphere doesn't do. The atmosphere absorbs specific wavelengths (e.g., some infrared, UV) and transmits others, so it's a selective absorber.

Answer:

C. Selective absorber