单项选择题

Questions 11 to 14 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Now, listen to the passage. Why do learner drivers have to keep their present jobs

A.They don’t want their present bosses to know what they’re doing.
B.They want to earn money from both jobs.
C.They cannot earn money as taxi drivers yet.
D.They look forward to further promotion.