Suppose you estimate the CAPM for asset A using the regression CA.t+1-rf = +B+ (rmxt - rf)+t and find that a = 0.04, B = 1.25, and o? = 0.5. If we assume a risk free rate of rf = 1%, an average market rate of return of u Mkt = 7%, and a standard deviation of the market excess return of Qc = 0.4, then what fraction of the total variance of the expected excess return for this assetnigsystematic? A) 0.556 B) 0.286 C) 0.333 D) 0.500 E) none of the above