Which of the following statements is FALSE? e) When we combine many stocks in a large portfolio, the firm-specific risks for each stock will average out and be diversified. b) Stock returns will tend to move together if they are affected similarly by economic events. c) The volatility in a large portfolio will decline until only the systematic risk remains a) The risk premium of a security is determined by both its systematic risk and its diversifiable risk d) Fluctuations of a stock's return that are due to economy-wide news are common risks