PT 62 S4 Q5

Researchers announced recently that over the past25 years the incidence ... ...

Which one of the following, if true, most weakens the argument?
(A) Most people who purchase a sunscreen product will not purchase the most expensive brand available.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Complete Section: LR-B, Dec. '10 LSAT (PT 62 Sec. 4)