OG4 阅读 Q15

Choice A is the best answer. In lines 36-39("America's...decades"), the author provides evidence that many major American cities are currently experiencing economic hard-ship due to promises made in past years: "America's major cities face enormous fiscal problems, many of them the result of public pension obligations  they incurred in the more prosperous years of the past two decades." America's major cities made past promises, such as "public pension obligations," to their citizens, which caused their current financial situation.
Choices B, C, and D are incorrect because they do not provide evidence that many major American cities are currently experiencing economic hardship due to promises made in past years.