M: When will the bus stop for lunch
W: I think the driver said we’d stop at 12:30.
M: How long will we have to eat
W: The lunch stop is for an hour.

What time will the lunch be finished（）

A. both their watches were good
B. neither of their watches could tell the correct time
C. there was something wrong with the German watch
D. there was nothing wrong with the Japanese watch

A. that
B. which
C. what
D. who