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".

Example Input: [header] How to buy a last minute cheap flight [title] Check airline newsletters, websites that specialize in last minute air travel and the travel section of your local newspaper to find last minute deals on flights. [step] Sometimes you can save money by booking flights late because airlines that have not filled their planes will offer discount fares. [title] Compare airfares from different airlines, websites and travel agencies. <sep> (A) [step] Look at every airline's website so that you can compare and contrast prices. [title] Opt for free flights as before, otherwise follow the full booking program and you'll not miss your flight in a long time. (B) [step] Try booking flights from big-ticket airlines such as kiwi airlines and delta. [title] Compare prices from travel agencies that are offering cheaper flights. (C) [step] Purchasing flights directly from the airline is not always the cheapest deal, so check out a few different travel websites and travel agencies to compare prices. [title] Search for flights during undesirable days and times. (D) [step] Compare each airline's prices with the prices you are interested in. You might be able to find a cheaper flight for free.
Example Output: C

Example Input: [header] How to sleep peacefully, and have good dreams at the same time [title] Relax before bed. [step] If you have a hard time getting to sleep, you should take some steps to help you relax and prepare for bed before you want to go to sleep. Spending some time relaxing and clearing your mind can help you to fall asleep more quickly and sleep peacefully through the night. <sep> (A) [substeps] Take a few breaths before bed, if you feel like you may need it. When you feel sleep approaching, take some deep breaths. (B) When you get up in the morning, make sure you have plenty of time to gather your thoughts before bed. Even a quick cup of coffee and some breathing exercises before bed can help you drift into sleep. (C) [substeps] Take a shower and do some light and relaxing activities before bed. If you can, do them before you do anything else. (D) There are lots of different techniques you can try to help you relax before bed, such as : [substeps] Practicing some gentle yoga stretching. Progressively tensing and then relaxing the muscles in your body.
Example Output: D

Example Input: [header] How to get a cat sitter when you leave town [title] Ask a friend or relative to stay at your house. [step] Many people feel the most comfortable asking a trusted and responsible friend, relative, or neighbour to look after their cat while on vacation. The best option is to find someone who can stay at your house with your cat. <sep> (A) [substeps] Ask your friend or relative to look after your pet while you are on vacation. [title] Find a regular bed or couch sitter. (B) [title] Watch for signs of illness or injury while on vacation. [step] If you have gone on vacation, make sure your pet stays at home so they can perform certain tasks without being injured. (C) Asking any person this option is definitely not fun. Think about how large or how many cats you want to keep, and ask yourself how many pets you really need. (D) This way your cat will be able to remain in a comfortable environment and will have company throughout the day. [substeps] It is best to choose someone how knows your cat and has experience with companion animals.
Example Output:
D