Consider the following average annual returns: Average Return 23.1% Investment Small Stocks S&P 500 13.7% Corporate Bonds Treasure Bonds 7.2% 6.5% Treasury Bills 4.4% What is the excess return for the S&P 500? O A. 15.9% O B. 9.3% O C. 11.2% O D. 0% Click to select your