In Japan in 1998 and in the U.S. in 2008, interest rates were negative for a short period of time because investors found it convenient to hold six-month bills as a store of value because
A) of the high inflation rate.
B) these bills sold at a discount from face value.
C) the bills were denominated in small amounts and could be stored electronically.
D) the bills were denominated in large amounts and could be stored electronically.