which is the correct ordering of returns over the period 1926 to 2017 from lowest to highest? a. treasury bills, common stock, long-term corporate bonds, long-term gov't bonds b. common stock, long-term gov't bonds, long-term corp bonds, treasury bills c. treasury bills, long-term gov't bond, long-term corp, common stock d. long term corp bonds, treasury bills, long-term gov't bonds, common stock