请老师再讲解一下这道题，包括这道题涉及的考点是什么

问题如下：

With respect to interest rates, differences in currency risk across countries are reflected in:

选项：

A.real interest rates only. B.nominal interest rates only. C.both real interest rates and nominal interest rates.

解释：

A Incorrect because riskier currencies have both higher real and nominal interest rates. Economists typically separate the nominal interest rate into the real interest rate, an inflation premium, and a risk premium. Investors in a riskier country will require a risk premium for holding the currency, which will be reflected in nominal and real interest rates that are higher than would be expected under the international Fisher effect and real interest rate parity conditions.

B Incorrect because riskier currencies have both higher real and nominal interest rates. Economists typically separate the nominal interest rate into the real interest rate, an inflation premium, and a risk premium. Investors in a riskier country will require a risk premium for holding the currency, which will be reflected in nominal and real interest rates that are higher than would be expected under the international Fisher effect and real interest rate parity conditions.

C Correct because riskier currencies have both higher real and nominal interest rates. Economists typically separate the nominal interest rate into the real interest rate, an inflation premium, and a risk premium. Investors in a riskier country will require a risk premium for holding the currency, which will be reflected in nominal and real interest rates that are higher than would be expected under the international Fisher effect and real interest rate parity conditions.