True or false with explanation please

TRUE-or-FALSE Questions: You must supply a one or two sentence explanation of your answer. (a) You just ran a regression relating the excess returns of a portfolio of small stocks to the excess returns on the S\&P 500. You found that the intercept in this regression is negative and statistically significant. This means that the S\&P 500 is not meanvariance efficient. (b) The return of XYZ's stock is perfectly correlated with the market return. According to the CAPM, the expected return of XYZ's stock is equal to the market return. (c) Because of the potential for diversification, if two stocks are not perfectly correlated, a portfolio that invests 50% in each stock must be less risky than a portfolio invested in just one of the stocks. (d) The return of an asset that has a =1 is perfectly correlated with the market. (e) Researchers found that, on average, small-cap stocks tend to earn a higher rate of return than large-cap stocks