Which of the following statements is TRUE?

A) The risk premium for common risk is zero, so investors are not compensated for holding the risk

B) Beta is the expected percent change in the excess return of the market portfolio for a 1% change in the excess return of a security

C) Volatility measures systematic risk, while beta measures idiosyncratic risk

D) Beta is an appropriate measure of risk for an individual security and determines the risk premium of a security