Questions 8 to 10 are based on the following conversation. At the end of the conversation, you will be given 15 seconds to answer the questions. Now listen to the conversation. Why is John studying

A．He needs to press F7 to return to the document before he prints it.
B．He has to print the document to see the page numbers.
C．The printer is not working correctly.
D．The numbers are on the screen but they don’t print out.