QUESTION 25 Consider a risk-averse mean-variance investor. The investor has a risk aversion of 5. The investor's current portfolio has an expected return of 15% and a return volatility of 19%. Suppose that the expected return of the portfolio returns drops to 8%. To which level should the volatility decrease to keep the investor as satisfied with the portfolio as before the decline in expected retums? O A 9.0% OB. 14.296 C. 20.8% OD. 15.496