Which is the most accurate statement?

A) The gold standard does not work in theory or practice.
B) The euro is the official currency in every European country.
C) There is virtually no difference between the gold standard and the gold exchange standard.
D) At one time an ounce of gold was worth $35.

Gold Standard

A monetary system where a country's currency or paper money has a value directly linked to gold; countries committed to convert paper money into a fixed amount of gold upon request.

Gold Exchange Standard

A monetary system in which countries peg their currencies to a specific amount of gold but may also hold foreign currencies in reserves.

Euro

The official currency of 19 of the 27 European Union countries, which is used by over 340 million Europeans. The euro aims to facilitate a single European market, foster economic stability, and promote economic integration among its members.