Questions 17 ～ 20 are based on a monologue by a tour guide giving some information about the BART system. You now have 20 seconds to read Questions 17 ～ 20.
What is the cost of a round trip

A．It dropped due to the weakness of the eurozone economies and the inexperience of the European Central Bank in dealing with the international markets.
B．People in most European countries refused to use euro instead of their own currency.
C．Counterfeiters made a lot of fake notes since people were not familiar with the new currency.
D．Some countries are not ready for the euro. They stopped using euro in daily purchasing.