Suppose that a fund has an average annual return of 19%. A regression of the fund's returns on the S&P 500 index returns results in a beta of 1.2. In this period, the expected market return has been 13% and the riskless rate is 6%. The fund's information ratio (defined as CAPM alpha divided by return volatility) is 0.15. What is the fund's return volatility? A. 42.39% B. 8.36% C. 13.14% D. 30.67%