Car owners can display a decal to authorize police to stop the drivers during certain hours. The theft rate for cars has bearing such decals is lower than usual for the cars in the neighborhood. The program has effectively reduced theft.
What assumption has the most impact on the conclusion?
(C) is incorrect because the answer to this question has no impact on the conclusion. Let's say the cars in the participant neighborhoods are sometimes stolen during daylight hours, this alone would neither negate nor strengthen the fact that the program reduced night theft and the level of theft overall. The correct answer choice points to an alternative explanation to question the cause/ effect relationship between the decal program and car theft.
