PT 9 S2 Q8

Most of the ultraviolet radiation reaching the Earth's atmosphere from ... ...

Which one of the following, if true, best reconciles the apparently discrepant facts described above?
(A) Ultraviolet radiation increases the risk of skin cancer and cataracts; the incidence of skin cancer and cataracts increased substantially between 1969 and 1986.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Practice Set: "Resolve/Explain" Questions, Set 2 - Difficult/Uncommon Mix (25Q)