Questions 161~163 refer to the following instant messaging chain.
 Frank: Hey Annie, have you figured out when we can take that trip to Montreal?
 Annie: I checked my work schedule and it looks like I'm free next weekend. How aboutyou? 
Frank: Unfortunately, I have a meeting with a client next Saturday. Can we schedule itfor the following weekend? 
Annie: I wish we could, but I already have plans to visit my family that weekend. Whatabout the weekend after that? 
Frank: I'm afraid I won't be able to make it then either. I have a project deadline onMonday, and I need to work on it over the weekend. 
Annie: Hmm, that's too bad. What about the weekend after that? 
Frank: Sorry, Annie, but that won't work for me either. I have a business tripscheduled that weekend. 
Annie: I see. Well, I guess we'll have to postpone our trip to Montreal for now. It'sfrustrating that our schedules just don't seem to align. 
Frank: Yeah, it is. But don't worry, we'll find a time soon enough.
【題組】161. What is the NOT main reason why Frank and Annie cannot take their trip to Montreal?
(A) Frank has a meeting with a client.
(B) Annie has to work on a project deadline.
(C) Frank has a business trip scheduled.
(D) Annie has plans to visit her family.