Which one of the following, if true, would most undermine the connection ... ...

Which one of the following, if true, would most undermine the connection that the author draws between increased size and monopoly power?
(A) In some industries, there are businesses that are able to exert monopoly power in one geographical region even though there are larger businesses in the same industry in other regions.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Dec 2012 LSAT (PT 68): Reading Comprehension