Below is a chart of efficient frontier, which of the following statement related to the chart is incorrect?

A. Each point in the chart represents countrys market which yields a unique combination of risk and return

B. The Sharpe ratio of a countrys fund is expressed as the slope of the line from the origin point to the countrys coordinate point

C. The Sharpe ratio of a countrys fund is expressed as the slope of the line from the risk-free point to the countrys coordinate point

D. The flatter the slope line, the higher Sharpe ratio

Selection of the Optimal International Portfolio 2.0% Efficient frontier SD 1.5% HIK OIP NL IT GM US ON 1.0% JP Monthly Return 0.5% RI 0.0% 0.0% Monthly Standard Deviation 5.0% 6.0% 70% 80% 90% 10% 1.0% 2.0% 30% 4,0%