问题如下图：
选项：
A. 
B. 
C. 
解释：
能否推导一下答案的原理？
NO.PZ2016010802000157问题如下A country thmaintains a target exchange rate is most likely to have whioutcome when its inflation rate rises above the level of the inflation rate in the target country?A.increase in short-term interest rates.B.increase in the mestic money supply.C.increase in its foreign currenreserves.is correct.Interest rates are expecteto rise to protethe exchange rate target.本国通胀上涨超过了目标国会导致本国的汇率上升。通胀上升会导致本国货币贬值，为了保证本国货币不贬值，必须实施一个紧缩的货币政策。A提高短期利率入选。B增加货币供给是一个扩张的货币政策，利率下降，不入选。C增加外汇储备和本题无关。不入选。现在汇率升了，为了维持target exchange rate，不应该降汇率吗？
NO.PZ2016010802000157 问题如下 A country thmaintains a target exchange rate is most likely to have whioutcome when its inflation rate rises above the level of the inflation rate in the target country? A.increase in short-term interest rates. B.increase in the mestic money supply. C.increase in its foreign currenreserves. is correct.Interest rates are expecteto rise to protethe exchange rate target.本国通胀上涨超过了目标国会导致本国的汇率上升。通胀上升会导致本国货币贬值，为了保证本国货币不贬值，必须实施一个紧缩的货币政策。A提高短期利率入选。B增加货币供给是一个扩张的货币政策，利率下降，不入选。C增加外汇储备和本题无关。不入选。 为什么本国通胀上涨超过了目标国会导致本国的汇率上升？又为什么通胀上升会导致本国货币贬值？
NO.PZ2016010802000157 问题如下 A country thmaintains a target exchange rate is most likely to have whioutcome when its inflation rate rises above the level of the inflation rate in the target country? A.increase in short-term interest rates. B.increase in the mestic money supply. C.increase in its foreign currenreserves. is correct.Interest rates are expecteto rise to protethe exchange rate target.本国通胀上涨超过了目标国会导致本国的汇率上升。通胀上升会导致本国货币贬值，为了保证本国货币不贬值，必须实施一个紧缩的货币政策。A提高短期利率入选。B增加货币供给是一个扩张的货币政策，利率下降，不入选。C增加外汇储备和本题无关。不入选。 1. 为什么要提高短期利率？短期利率提高，长期利率不变，Interest sprea变小了，那就有可能导致经济衰退，经济预期就不好了呀。所以是不是应该提高长期利率？2. 通胀高了，本币汇率就下降了，这个时候如果央行增加外币持有量，就可以给本币汇率托底，那C为什么不对呢？谢谢老师。
NO.PZ2016010802000157 问题如下 A country thmaintains a target exchange rate is most likely to have whioutcome when its inflation rate rises above the level of the inflation rate in the target country? A.increase in short-term interest rates. B.increase in the mestic money supply. C.increase in its foreign currenreserves. is correct.Interest rates are expecteto rise to protethe exchange rate target.本国通胀上涨超过了目标国会导致本国的汇率上升。通胀上升会导致本国货币贬值，为了保证本国货币不贬值，必须实施一个紧缩的货币政策。A提高短期利率入选。B增加货币供给是一个扩张的货币政策，利率下降，不入选。C增加外汇储备和本题无关。不入选。 RT
NO.PZ2016010802000157 问题如下 A country thmaintains a target exchange rate is most likely to have whioutcome when its inflation rate rises above the level of the inflation rate in the target country? A.increase in short-term interest rates. B.increase in the mestic money supply. C.increase in its foreign currenreserves. is correct.Interest rates are expecteto rise to protethe exchange rate target.本国通胀上涨超过了目标国会导致本国的汇率上升。通胀上升会导致本国货币贬值，为了保证本国货币不贬值，必须实施一个紧缩的货币政策。A提高短期利率入选。B增加货币供给是一个扩张的货币政策，利率下降，不入选。C增加外汇储备和本题无关。不入选。 通胀不是本国的货币多了么，钱多了，借钱成本（短期利率）降低才对。不太懂
