Susan has 40% of her portfolio invested in a mutual fund to track the S&P 500 and 40% in a mutual fund to track the Dow Jones Industrial Average (DJIA) and 20% in government securities. To evaluate the performance of her portfolio, Susan’s best benchmark is
A: The DJIA Index
B: The S&P 500 Index
C: A government security index
D: A 50%/50% combination of A and B
E: A combination of A, B and C