A stock has annual returns of 8.0 percent, 12.5 percent, -4.8 percent, and 16.9 percent for the past four years. The arithmetic average of these returns is percent while the geometric average return for the period is__ percent. Select one: O a. 8.75; 8.54 b. 8.23; 8.21 C. 8.15; 7.83 d. 8.33; 8.12 e. 7.98; 8.21