Viewers surveyed immediately after the televised political debate last ... ...

Viewers surveyed immediately after the televised political debate last year between Lopez and Tanner tended to think that Lopez had made the better arguments, but the survey respondents who reported that Lopez’s arguments were better may have been biased in favor of Lopez. After all, Lopez eventually did win the election.

Which one of the following, if true, most seriously undermines the argument?


(A) Most people who voted in the election that Lopez won did not watch the debate.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in PT70 (Oct 2013): Logical Reasoning B