题目选项分析

[span]If the airspace around centrally located airports were restricted to commercial airliners and only those private planes equipped with radar, most of the private-plane traffic would be forced to sue outlying airfields. Such a reduction in the amount of private-plane traffic would reduce the risk of midair collision around the centrally located airports.[/span]

The conclusion drawn in the first sentence depends on which of the following assumptions?

【选项】A reduction in the risk of midair collision would eventually lead to increases in commercial airline traffic.