Assuming that the investor wants to choose one of the three assets of A, B, and C to invest, it is estimated that the rate of return of each asset in the second year may have four results, and each estimated result has a probability corresponding to it. Which asset would you choose? why?

A B C r p r p r p 1 0. 20 1 0. 20 0.15 0.05 0.30 0.60 0.10 0.15 0.40 N 0.30 0.50 0.05 3 0.10 0.20 0.60 0.00 0.15 4 0.05 0.30 -1. 00 0.05 -0. 10 0.30