The historical record for the period 1926-2014 shows that the annual nominal rate of return on:
A. U.S. Treasury bills have had a positive rate of return for every year in the period.
B. the Consumer Price Index has been positive every year.
C. risk-free securities has averaged around 5 percent.
D. U.S. Treasury bills is constant.
E. large company stocks has averaged around 9 percent.