Reallocation of a retirement portfolio is important to maintain an appropriate level of risk over time. What general investment rule will help you reallocate your portfolio as you get older?

A. Use the 100 Your Age rule to determine the percentage of stocks you have in your portfolio.
B. Invest 10% of your gross income each period.
C. Always invest at least the minimum amount needed to get the maximum amount of matching from your employer.
D. Dont put all of your eggs in one basket (unless it is a very strong basket)