HELP ILL GIVE BRAINIEST PLEASE GIVE AN EXPLANATION TOO as radiation from the sun reaches earth, the energy is-

A ) Immediately radiated back into space.
B ) Absorbed by only the oceans.
C ) Radiated, reflected, and absorbed
D ) only reflected by clouds in the atmosphere

The illuminance of a surface varies inversely with the square of its distance from the light source. if the illuminance of a surface is 120 lumens per square meter when its distance from a certain light source is 6 meters, by how many meters should the distance of the surface from the source be increased to reduce its illuminance to 30 lumens per square meter?