Atomic theory and how it relates to the trends and patterns in the periodic table

the ozone layer acts as a filter for the shorter wavelength and highly hazardous ultraviolet radiation (uvr) from the sun, protecting life on earth from its potentially harmful effects. when the sky is clear, there is an inverse relationship between stratospheric ozone and solar uvr measured at the earth's surface.

a:

by the combination of an unlimited number of elements

the answer is c

tell me if wrong