Your retirement portfolio comprises 300 shares of the S&P 500 fund (SPY) and 100 shares of iShares Barclays Aggregate Bond Fund (AGG). The price of SPY is $138 and that of AGG is $97. If you expect the return on SPY to be 15% in the next year and the return on AGG to be 7%, what is the expected return for your retirement portfolio? O A. 13.48% OB. 10.79% O C. 12.81% OD. 12.13%