Stock X Has a Beta of 0

Stock X has a beta of 0.7 and Stock Y has a beta of 1.7.Which of the following statements must be true, according to the CAPM?

A) Stock Y's realized return during the coming year will be higher than Stock X's return.
B) If the expected rate of inflation increases but the market risk premium is unchanged, the required returns on the two stocks should increase by the same amount.
C) Stock Y's return has a higher standard deviation than Stock X.
D) If the market risk premium declines, but the risk-free rate is unchanged, Stock X will have a larger decline in its required return than will Stock Y.
E) If you invest $50,000 in Stock X and $50,000 in Stock Y, your 2-stock portfolio would have a beta significantly lower than 1.0, provided the returns on the two stocks are not perfectly correlated.