Suppose Bitcoin finds wide acceptance as a currency. Which of the following operations would still NOT be possible using Bitcoin?
A. A management consultant maintains a savings account in Bitcoin.
B. A U.S. manufacturer pays its Chinese steel supplier in Bitcoin.
C. A mercantile exchange lists commodity prices in Bitcoin.
D. A college student uses Bitcoin to buy her books on Amazon.
E. A central bank expands the supply of Bitcoin in response to an economic downturn.
