问题如下：
Which of the following is the most likely example of a tool of fiscal policy?
选项：
A.Public financing of a power plant.
B.Regulation of the payment system.
C.Central bank’s purchase of government bonds.
解释：
A is correct.
Public financing of a power plant could be described as a fiscal policy tool to stimulate investment.
考点： tool of fiscal policy
解析：
SPENDING TOOL有三种工具。转移支付、经常支付，资本支付（基建建设）A选项就属于基建建设，所以A选项入选。
支付系统和货币金融相关，肯定不是财政工具，B选项不入选。
C选项是公开市场操作，是货币工具，也不入选。
financing是融资的意思吧~ 发电厂建设的公众融资？
