Rank the following from highest average historical standard deviation to lowest average historical standard deviation from 1926 to 2010.
I. Small stocks
II. Long-term bonds
III. Large stocks
IV. T-bills
A. I, II, III, IV
B. III, IV, II, I
C. I, III, II, IV
D. III, I, II, IV
Answer: C. I, III, II, IV