PT 61 S2 Q11

Psychologists observing a shopping mall parking lotfound that, on average, ... ...

Which one of the following, if true, most weakens the reasoning?
(A) The more pressure most drivers feel because others are waiting for them to perform maneuvers with their cars, the less quickly they are able to perform them.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Complete Section: LR-A, Oct. '10 LSAT (PT 61 Sec. 2)