A、Joan may have taken a wrong train. B、Joan won’t come to the conference. C、Joan will miss the next conference. D、Joan may be la

M: I’m sorry, madam. The plane is somewhat behind the schedule. Take a seat. I’ll inform you as soon as we know something definite.
W: Thank you. I’d rather look around and I’ll be back in several minutes.
Q: What can be concluded about the plane?

M: Where is Joan? She said she would be here at three, and now it’s three thirty. She mast have missed the train.
W: I think so. But I hope she won’t miss the next one. Otherwise she will be late for the opening address of the conference.
Q: What’s the woman worried about?