单项选择题
W: How long do you think this project might take
M: I’d say about three months, but it could take longer if something unexpected happened. Maybe we’d better allow an extra month, so we won’t have to worry about being late.
Q: Why does the man say extra time should be allowed for the project
A．In case some problem should occur.
B．Something unexpected has happened.
C．To avoid more work later on.
D．To make better preparations.