The historical record for the period 1926-2014shows that the annual nominal rate of return on:

a) risk-free securities has averaged around 5 percent.

b) large company stocks has averaged around 9 percent.

c) U.S. Treasury bills have had a positive rate of return for every year in the period.

d) U.S. Treasury bills is constant.

e) the Consumer Price Index has been positive every year.