Over the long run (90 or so years), the variability (standard deviation)of average annual rates of return in the United States have been lowest for which of the following securities?

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Government bonds, particularly those with shorter maturities, are considered to be among the safest investments available. These bonds are backed by the full faith and credit of the U.S. government, and as a result, they have historically experienced very little volatility in terms of returns. On the other hand, corporate bonds and stocks, particularly those of smaller companies, tend to be more volatile and can experience significant swings in returns over time. Therefore, A) five-year government bonds have the lowest variability of average annual rates of return over the long run.

Over the Long Run (90 or So Years), the Variability