Three years ago, Green Thumb Industries (ticker symbol: GTBIF) had a stock return of 17.83%. What is the standard deviation of Green Thumbs returns if, over the next two years, the company had returns of -7.27% and 23.87%, respectively?

a) 27.27% b)13.07% c) 16.51% d) 9.62% e) 2.73%