A stock has an expected rate of return of 8.3% and a standard deviation of 6.4%. Which one of the following best describes the probability that this stock will gain 27.5% or more in any one given year? A. less than 0.5% B. less than 1.0% C. less than 1.5% D. less than 2.5% E. less than 5% (please show work)