PT 62 S2 Q19

In West Calverton, most pet stores sell exotic birds, andmost of those ... ...

If the statements above are true, which one of the following must be true?
(A) Most pet stores in West Calverton that are not independently owned do not sell exotic birds.
(B) ...
(C) ...
(D) ...
(E) ...

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