A Review of Annualized Equity Risk Premiums by Country for the Period

A review of annualized equity risk premiums by country for the period 1900 to 2010 shows that

A) country with the lowest standard deviation had the lowest equity risk premium.
B) the standard deviation of returns was consistent among countries.
C) the sharpe ratio for each country is equal.
D) the United States had the highest risk premium of the countries listed.
E) Sharpe ratios vary significantly among countries.