You earned a rate of return of 5% at the of year 1, 2% at the end of year 2, 10% at the end of year 3, 3% at the end of year 4, and 20% at the end of year 5. Find the standard deviation of the returns. A. 5.89% B. 7.33% C. 8.76% D. 10.25% E. 15.89%