11.   

Radio stations with radio datasystem (RDS) technology broadcast special program information that only radioswith an RDS feature can receive.  Between1994 and 1996, the number of RDS radio stations in Verdland increased from 250to 600.  However, since the number ofRDS-equipped radios in Verdland was about the same in 1996 as in 1994, thenumber of Verdlanders receiving the special program information probably didnot increase significantly.

Which of the following is anassumption on which the argument depends?

(A) Few if any of the RDS radiostations that began broadcasting in Verdland after 1994 broadcast to peoplewith RDS-equipped radios living in areas not previously reached by RDSstations.

(B) In 1996 most Verdlanders wholived within the listening area of an RDS station already had a radio equippedto receive RDS.

(C) Equipping a radio station withRDS technology does not decrease the station's listening area.

(D) In 1996 Verdlanders who did notown radios equipped to receive RDS could not receive any programming from theRDS radio stations that began broadcasting in Verdland after 1994.

(E) The RDS radio stations inVerdland in 1996 did not all offer the same type of programming.

请教各位：这道题为什么不能选D，将D 取非以后也可以weaken结论啊。。