Which one of the following is an accurate statement? a) to calculate an expected risk premium you need to compute the expected return on an average risky asset and the return on a risk-free asset. b) the risk premium is the difference between the return on a risky asset and the return on a market portfolio. c) the expected return on an asset decreases as the firm-specific risk increases. d) a comparison of two different risky assets can not be simplified by computing the expected return on each asset. e) the expected return on a security depends on the expected states of the economy but not on the associated probabilities of those states occurring.