The correct option is B By the taxing and borrowing powers of the government.
Fiat money is
currency that a government has declared to be legal tender, but it is not
backed by a physical commodity. The value of fiat money is derived from the
relationship between supply and demand rather than the value of the material
that the money is made of. Historically, most currencies were based on physical
commodities such as gold or silver, but fiat money is based solely on the faith
and credit of the economy.