题目选项分析

The city of Littleville wishes to institute a congestion charge, in which cars driving through the most crowded streets of Littleville, in the downtown area, would pay a fee when they did so. Proponents argue that, in these circumstances, most of the drivers in the city would choose to use outlying roads. This reduction in the traffic in downtown Littleville would help reduce the number of car accidents in the area.

The conclusion drawn in the above argument depends on which of the following assumptions?

【选项】Most of Littleville's outlying roads are equipped only to handle cars and not the kind of commercial trucks that often have to make downtown deliveries.