You have a market portfolio and the risk premium for holding it is 5% per year. rf = 5%. There are two new stock issues: A or B. A stock has a standard deviation of 40%, a beta of 0.5, and an expected return of 8.0%. B stock has a standard deviation of 30%, a beta of 1.0, and an expected return of 9.0%. If you can add at most one stock to your portfolio, which one do you choose?