PT 64 S1 Q13

Medical researcher: Scientists compared a large groupof joggers who habitually ... ...

Which one of the following, if true, would most weaken the medical researcher’s argument?
(A) For both groups of joggers compared by the scientists, the rate of jogging injuries during the study was lower than the overall rate of jogging injuries.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Oct 2011 LSAT (PT 64): Logical Reasoning A