Prep 37, section 2, # 17 Forum

[soyeonjeon]

17. A safety report indicates that, on average, traffic fatalities decline by 7 percent in those areas in which strict laws requiring drivers and passengers to wear seat belts have been passed. In a certain city, seat belt laws have been in effect for two years, but the city’s public safety records show that the number of traffic deaths per year has remained the same.

Which one of the following, it true, does NOT help resolve the apparent discrepancy between the safety report and the city’s public safety records?
(A) Two years ago speed limit in the city were increase by as much as 15 kph (9 mph)
(B) The city now includes pedestrian fatalities in its yearly total of traffic deaths whereas two years ago it did not
(C) In the time since the seat belt laws were passed, the city has experienced a higher than average increase in automobile traffic.
(D) Because the city’s seat belt laws have been so rarely enforce, few drivers in the city have complied with them
(E) In the last two years, most of the people killed in car accidents in the city were not wearing seat belts

I think that all of them resolve the discrepancies.
Answer choice for this problem did seem likely to become an answer but I don't logically see how it fails to resolve the discrepancy. If there is more traffic, there necessarily is an increase chance for traffic accidents, which accordingly would increase the record on the number of traffic deaths per year. And together with the decrease that would arise as a result of the safety report, the number of traffic accident could remain the same.