A、Air traffic problems. B、Safety improvement. C、The number of the flights. D、Flight training courses. B从“Travelers face a paraly

W: Could you have my car ready at 5:00, please.
M: Sure, the damage is minor.
Q: Where did this conversation probably take place?

W: As you know, the sky has become ever more crowded. I think, the standards of training must be raised among flight crews and air traffic controllers.
M: There is an urge need to raise levels of air safety throughout the work. Travelers face a paralyzed future unless air safety improves.
Q: What is mainly discussed in the conversation?