1. We believe that the single factor model r, = E(r,) + iF + q, where E(e,-) = O and = O can predict any individual asset's realized rate of return well. Both Portfolio A and Portfolio B are well-diversified 1.2 0.1 0.8 0.08 (a) What is the rate of return of the risk-free asset? (b) What is the expected rate of return of the well-diversified portfolio C with '3C 1.6, which also exists in the market? (c) A fund constructs a well-diversified portfolio D. Studies show that = 0.6. The expected rate of return of D is 0.06. Is there an arbitrage opportunity? If so, construct a trading strategy to earn profits with no risk. If not, why?