Stock A has a beta of 0.5 and Stock B has a beta of 1.5. Which of the following statements must be true about these securities? (Assume the market is in equilibrium.) Select one: O a. When held in isolation, Stock B has greater risk than Stock A. Ob. The required return on Stock A will be greater than that on Stock B. Oc Stock A would be a more desirable addition to a portfolio than Stock B Od. Stock A has less market risk than Stock B