PT 12 S4 Q12

Fossil fuel emissions, considered a key factor in the phenomenon known ... ...

Which one of the following, if true, most helps to explain the claim made in the last sentence above?
(A) Carbon dioxide stays in the atmosphere for many decades, while the sulfate aerosols fall out within days.
(B) ...
(C) ...
(D) ...
(E) ...

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