When officials in Tannersburg released their plan to widen the city's main roads, environmentalists protested that widened roads would attract more traffic and lead to increased air pollution. In response, city officials pointed out that today's pollution-control devices are at their most effective in vehicles traveling at higher speeds and that widening roads would increase the average speed of traffic. However, this effect can hardly be expected to offset the effect pointed out by environmentalists, since __. Which of the following most logically completes the argument? ["a vehicle traveling on a route that goes through Tannersburg will spend less time on Tannersburg's roads once the roads are widened", 'most of the air pollution generated by urban traffic comes from vehicles that do not have functioning pollution-control devices', 'several of the roads that are slated for widening will have to be closed temporarily while construction is underway', 'increases in traffic volume generally produce decreases in the average speed of traffic unless roads are widened']