Q: In this task, you are given a context and four options. Each option is a suggested ending for the context. You should read the context and pick the best ending for the context. Please answer with "A", "B", "C", and "D".
[header] How to ship a cat [title] Pick a date. [step] Most of the time, you can't book a cargo flight ahead of time. However, you can call and reserve a space on your preferred flight and airline. <sep> (A) By limiting cabin time, this will save on cost of boarding and internet costs. [title] Research the airline's policies regarding transfer of pets on board. (B) Book an overnight flight with another company and have them fill a check-in box for you. [title] Have an agency build an account or create a recurring flyer with your departure and arrival dates. (C) You don't have to book a day early so it won't cost you anything. You can simply ask " i'm serious about picking a day for my shipment. (D) It's best to call and talk to someone so you have all the details worked out. Note that you will pay for your pet the day of shipping.
A:
D