听力原文：W: Hi, Ralf, how are you doing？
M: Hi, Samantha, I'm fine, but I am not happy about the new 15% increase in bus transportation fares. I don't think it is fair to students, poor people, and old people on fixed incomes. Transportation is now a major consideration in my budget.
W: You know how to get the student discount, don't you, Ralf？
M: What student discount, Samantha？
W: It's only for full-time students. Are you full time？
M: Yes, I am a full-time student.
W: Well then, you would qualify. Take your student card to the Derbyshire Building on Johnson Road. The Metro Pass is available there to all students from our university. The Student Union made a deal with them last year—I think part of our student union dues may be involved，but I am not sure. Anyway，you can get a monthly student pass that gives you unlimited，all zone access to public transit anywhere in the greater regional district for half price—$50 a month.
M: Really？ Only 50 dollars？ why didn't I know about that？
W: There was a page on it in “the Information for New Student Packet” that the Student Union sends welcoming to all students.
M: Oh, I remember that package. It included a welcome letter and a bunch of advertisements.
W: Yes，but one of the ads was from City Metro，explaining it all.
M: I just threw the whole envelope out. I am so sick of looking at advertisements. It annoys me that so much paper is wasted on material that is of no interest to me.
W: Well, I am sure if you go to the Derbyshire Building, there will be lots of information there. How many zones do you travel？
M: I have to go 3 zones. It takes me over an hour to get home.
W: Well, this pass would be especially good for you. It has the same cost regardless of how many zones you travel. I use it on weekends sometimes to visit my grandparents—they are 5 zones from my place so it's really cheap.
M: I am so glad you told me about this. I have been so worried about all my expenses since starting college that I hardly ever have a doughnut with my coffee. I think I will celebrate this news this afternoon. and buy a doughnut with my coffee. Can I invite you to join me？ This tip you gave me is worth a lot，I'd like to buy you a coffee.
W: That is very nice of you, but no need. I am glad I could help. I am going swimming after class today. I'm trying out for the college swim team. The coach is excellent.
M: Yes, I have heard that. Well, thank you so much, Samantha. I shall head over to the Derbyshire Building right now.
W: I forgot to mention this pass is only good until the end of the term，then you have to renew and the line-ups can get quite long. During the summer, it is not available. Also, when you pay, they don't take personal checks. I made that mistake when I went the first time—they accept credit cards and cash only. I doubt there will be any line-up today.
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At Citibank.
B. At a metro station.
C. At the Student Union Building.
D. At the Derbyshire Building.