U.S. Currency Has Value Primarily Because It

U.S. currency has value primarily because it:

A) is legal tender, is generally acceptable in exchange for goods or services, and is backed by the gold and silver of the federal government.
B) is generally acceptable in exchange for goods or services, is backed by the gold and silver of the federal government, and facilitates trade.
C) is relatively scarce, is legal tender, and is generally acceptable in exchange for goods and services.
D) facilitates trade, is legal tender, and permits the use of credit cards and near-monies.