Questions 5 to 8 are based on the following conversation. At the end of the conversation, you will be given 20 seconds to answer the questions. Now, listen to the conversation. Bartenders in American bars expect tips for all of the reasons EXCEPT that ______.
A．they provide a good service and they deserve the tips B．without enough tips they can’t make a living easily C．only in this way can they make up the difference between others D．their basic hourly pay is relatively rather low