Your retirement portfolio comprises 100 shares of the Standard & Poor's 500 fund (SPY) and 100 shares of iShares Barclays Aggregate Bond Fund (AGG). The price of SPY is $121 and that of AGG is $96. If you expect the return on SPY to be 11% in the next year and the return on AGG to be 6%, what is the expected return for your retirement portfolio? O A. 7.91% OB. 8.79% C. 10.11% D. 7.47%