Unusually large and intense forest fires swept the tropics in 1997. The ... ...

Unusually large and intense forest fires swept the tropics in 1997. The tropics were quite susceptible to fire at that time because of the widespread drought caused by an unusually strong El Niño, an occasional global weather phenomenon. Many scientists believe the strength of the El Niño was enhanced by the global warming caused by air pollution. Which one of the following can be properly inferred from the information above?
(A) Air pollution was largely responsible for the size and intensity of the forest fires that swept the tropics in 1997.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in June 2013 LSAT (PT69): Logical Reasoning B