The returns on the common stock of Maynard Cosmetic Specialties are quite cyclical.In a boom economy, the stock is expected to return 22 percent in comparison to 9 percent in a normal economy and a negative 14 percent in a recessionary period. The probability of a recession is 35 percent while the probability of a boom is 10 percent. What is the standard deviation of the returns on this stock?

A. 10.67 percent

B. 12.51 percent

C. 15.88 percent

D. 19.94 percent

E.22.86 percent