Which one of the following statements is true regarding the period 1926-2008?

	A.	The returns on small-company stocks were less volatile than the returns on large-company stocks.
	B.	U.S. Treasury bills had a positive average real rate of return.
	C.	The risk-free rate of return remained constant over the time period.
	D.	Bonds had an average rate of return that exceeded the average return on stocks.