With respect to major bond markets around

问题：

With respect to major bond markets around the world, which of the following statements is most accurate

A. Investors in one country that acquires bonds issued by the government of another country are believed to be risk-free.
B. The factors that affect yield spreads in the U. S. are different than the factors that affect yield spreads in other countries and between countries.
C. An investor in one country that buys bonds denominated in the currency of another country has unknown cash flows in the investor's domestic currency.