题目选项分析

The city of Workney, in raising bus fares from $1.00 to $1.25, proposed that 18 fare tokens be sold for $20.00 to alleviate the extra burden of the fare increase on the city's poor people. Critics suggested alternatively that 9 fare tokens be sold for $10.00, because a $20.00 outlay would be prohibitive for poor riders

The alternative proposal depends on which of the following assumptions?

【选项】The outlay of $10.00 for the purchase of 9 fare tokens would not be prohibitive for bus riders who are poor.