单项选择题


Questions 11 to 13 are based on the following interview between a reporter and a Taxi company manager about mobile phone hails u taxi. You now have 15 seconds to read Questions 11 to 13.
What is the most important factor for further development of taxi-hailing service

A.Utilizing GPS satellite technology.
B.Decreasing the extra business fare.
C.Having big, international expansion plans.
D.Adapting the technology and service to customers.