PT 61 S4 Q8

The giant Chicxulub crater in Mexico providesindisputable evidence that ... ...

Which one of the following, if true, would most weaken the argument?
(A) The vast majority of dinosaur species are known to have gone extinct well before the time of the asteroid impact that produced the Chicxulub crater.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Complete Section: LR-B, Oct. '10 LSAT (PT 61 Sec. 4)