【单选题】

{{I}} Questions 11-13 are based on the following talk introducing office systems. You now have 15 seconds to read questions 11-13.{{/I}} What has furnished a new market for sophisticated office equipment since the mid-1970s

A、The rapid growth of the service sector of the world economy.
B．The invention of the computer.
C．The rapid growth of the world economy.
D．The blurring of the line between the computer and other equipment.