M: How many stops until north station? ,F: You're on the wrong train. You need to get off at the next station and change to the green line. This is the red line.
(A) M: So there are only 4 stops to north station? That's close. (B) M: OK, so I need to change to the green line, right? The subway confused me. (C) M: I didn’t hear you. Please could you tell me again? (D) M: OK, I will get off the subway in two stations.
B