If the economy booms Meyer and company stock will have a return of 23.3 percent.if the economy goes into a recession the stock will have a loss of 11.8 percent .the probalility of a boom is 66 percent while the probability of a recession is 34 percent, what is the standard deviation of the returns on the stock?

A,15.05%

B,16.20%

C,16.63%

D,9.79%

E,13.79%