PT 62 S2 Q16

Tissue biopsies taken on patients who have undergonethroat surgery show ... ...

Which one of the following, if true, most strengthens the argument?
(A) The study relied on the subjects' self-reporting to determine whether or not they snored frequently.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Complete Section: LR-A, Dec. '10 LSAT (PT 62 Sec. 2)