单项选择题

Questions 14 to 17 are based on the following passage. At the end of the conversation, you will be given 20 seconds to answer the questions.
Now listen to the passage.

What is the passage mainly about

A.T.A. as a part-time job.
B.A Language program in US
C. T.A. and USC.
D.Qualifications and requirements of a T.