单项选择题

W:Excuse me,when will the 7:15 train arrive
M:It’s been delayed two hours because a bridge was broken.

What do we learn from this conversation()

A. The train has broken down and will not arrive.
B. The train was in a terrible accident.
C. The train will probably arrive at 9: 15.
D. The man is not sure whether the train will arrive or not.