Assume that large-company stocks had an average return of 11.4 percent and a standard deviation of 19.7 percent for a 40-year period. What range of returns would you expect to see on these stocks 95 percent of the time? A. -50.3 percent to 53.2 percent B. -50.3 percent to 73.9 percent C. -50.3 percent to 64.1 percent D. 28.0 percent to 50.8 percent E. -28.0 percent to 50.8 percent