Which of the following would a financial adviser most likely identify has having the highest risk using the coefficient of variation?

Select one

A$.$ Security A with an expected return of $8\%$ and a standard deviation of $9\%.$

B$.$ Security B with an expected return of $12\%$ and a standard deviation of $14\%.$

C$.$ Security C with an expected return pf $5\%$ and a standard deviation of $0\%.$

D$.$ Security D with an expected return of $15\%$ and a standard deviation of $15\%.$