A stock had annual returns of 16 percent, 18 percent, 0 percent, and 10 percent for the past four years. If the stock's returns are normally distributed, what is the 68 percent probability range of returns for any one given year? A. -0.42 to 20.74 percent B. 2.92 to 19.08 percent C. -5.16 to 27.36 percent D. -9.84 to 27.84 percent