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 $127 and that of AGG is $97. If you expect the return on SPY to be 9% in the next year and the return on AGG to be 4%, what is the expected return for your retirement portfolio? A. 6.15% B. 6.83% O C. 5.81% OD. 7.86%