Which one of the following principles underlies the author’s argument ... ...

Which one of the following principles underlies the author’s argument in the last paragraph of the passage?
(A) The adequacy of a solution to a political problem should be judged in terms of practical consequences rather than theoretical considerations.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Oct 2012 LSAT (PT 67): Reading Comprehension