Your portfolio has provided you with returns of 11.4 percent, 6.2 percent, -.7 percent, and 14.6 percent over the past four years, respectively. What is the geometric average return for this period? Seleccione una: O a. 7.25 percent O b. 7.57 percent O c. 7.72 percent O d. 7.63 percent O e. 7.55 percent