Consider the Regression Equation

Consider the regression equation:
R_i- r_f = g₀ + g₁b_i + g₂s²(e_i) + e_it
Where:
R_i - r_t = the average difference between the monthly return on stock i and the monthly risk-free rate
B_i= the beta of stock i
S²(e_i) = a measure of the nonsystematic variance of the stock i.
If you estimated this regression equation and the CAPM was valid,you would expect the estimated coefficient,g₁ to be

A) 0
B) 1
C) equal to the risk-free rate of return.
D) equal to the average difference between the monthly return on the market portfolio and the monthly risk-free rate.
E) equal to the average monthly return on the market portfolio.