PT 62 S2 Q13

Buying elaborate screensavers—programs that put movingimages on a computer ... ...

Which one of the following most closely conforms to the principle illustrated above?
(A) A school that chooses textbooks based on student preference may not get the most economical package.
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in Complete Section: LR-A, Dec. '10 LSAT (PT 62 Sec. 2)