Which One of the Following Statements Is Correct

Which one of the following statements is correct?

A) Exchange rates are adjusted each morning and held constant until the next morning.
B) The four most common currencies traded in the foreign exchange market are the U.S. dollar, franc, euro, and peso.
C) All of South America uses the peso as their currency.
D) New Zealand uses the same currency as Australia and that is the A$.
E) The foreign exchange market is the largest financial market in the world.