【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}} How have electronic links benefited professionals and managers

A、They can establish links with their business associates.
B．They do not have to make any business trips.
C．They do not have to work in their offices anymore.
D．They can improve their work efficiency.