CSC Chapter 5

老师，我看到PPT里有这么一题，不是很明白为什么选D，我的理解是应该选B，因为隔夜利率太低，才用SRA提升利率，谢谢
When will the Bank of Canada use SRAs?
A. When there is undesired upward pressure on overnight rates
B.When there is undesired downward pressure on overnight rates
C.When the exchange rate becomes volatile and moves outside of a desired trading range
D.When the money supply is decreasing too rapidly.