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

W：How do you feel about the environmental campaign conference?
M：Mary and the local people have formed conservation organisations ...
W：Where’s Mary? She said she would be here at nine.And now it’s nine thirty.She must have missed the train.
M：I think so, but I hope she won’t miss the next one.Otherwise, she should be late for the opening address of the conference.
Question：What’s the woman worried about？