The law will LEAST likely regard as a contract which of the following exchanges?
A.X will, today, convey to Y $100,000; Y will, today, convey to X the first U.S. postage stamp, issued in 1847, bearing a stated value of 5¢.
B.X will, today, convey to Y 100 ordinary single-dollar bills; Y will, today, convey to X four ordinary twenty-dollar bills.
C.X will, today, convey to Y one eight-ounce bottle of Coca-Cola for which X paid $1; Y will, today, convey to X one bottle of Pepsi-Cola for which Y paid 90¢.
D.X will, today, lend Y $100,000; Y will, one year from today, repay the $100,000 together with an additional $5,000.