PT 63 S3 Q16

Travaillier Corporation has recently hired employeeswith experience in ... ...

Which one of the following, if true, would most weaken the argument?
(A) In the past, Travaillier has found it very difficult to change its customers’ vacation preferences.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in June 2011 LSAT (PT 63): Logical Reasoning B