Which of the following is NOT a piece of evidence for the investor underreaction? A. Stocks with higher standardized unexpected earnings tend to earn higher returns in the future. B. The stock market index excess returns are positively autocorrelated at the monthly frequency. C. The stock market index excess returns are negatively autocorrelated at the three to five year horizons. D. Stocks with higher returns in the last six months tend to earn higher returns in the future.