The feature of APT that offers the greatest potential advantage over the simple CAPM is th

A．identification of anticipated changes in production, inflation, and term structure of interest rates as key factors explaining the risk-return relationship

B．superior measurement of the risk-free rate of return over historical time periods

C．use of several factors instead of a single market index to explain the risk-return relationship

D．variability of coefficients of sensitivity to the APT factors for a given asset over time