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

• Ignoring foreign markets reduced their choices of investment opportunities.

  
  

• Foreign markets have low correlations with U.S. markets.

  
  

• Returns on non-U.S. stocks can substantially exceed returns for U.S securities.

  
  

• All of the above.

  
  

• None of the above.