Which of the Following Are Reasons That U

Which of the following are reasons that U.S.investors should consider foreign markets when constructing global portfolios.

A) Ignoring foreign markets reduced their choices of investment opportunities.
B) Foreign markets have low correlations with U.S. markets.
C) Returns on non-U.S. stocks can substantially exceed returns for U.S securities.
D) All of the above.
E) None of the above.