Radio stations with radio data system (RDS) technology broadcast special program information that only radios with an RDS feature can receive. Between 1994 and 1996, the number of RDS radio stations in Verdland increased from 250 to 600. However, since the number of RDS-equipped radios in Verdland was about the same in 1996 as in 1994, the number of Verdlanders receiving the special program information probably did not increase significantly.
Which of the following is an assumption on which the argument depends?
The CR question posted by you has been discussed for times, you can search for the original posts to get the explanations. In a word, when you negate Answer A, the number of Verdlanders receiving the special program information would probably increase, because the scope of the listeners expands. In this case, it make the conclusion fall apart. So A is the answer.