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".

Ex 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.

Ex Output:
C

Ex Input:
[header] How to treat ingrown eyelids in dogs [title] Look for squinting. [step] Squinting is an easily recognized sign of eye irritation. Your dog may squint if it feels like there's something in the eye that it can't get out. <sep> (A) In this case, the ingrown eyelid is causing the eyelashes to rub directly against the eye. If you can't tell if your dog is squinting, compare the size of your dog's irritated eye to the other one. (B) This is not always an indication of eye irritation. It's often the case that tears will build up within the eyelids, which can cause the eyes to appear unfocused and dry. (C) It may also display its eyelids twitching or blinking repeatedly. Some dog owners find it embarrassing to have their dog squint because of its inability to see. (D) Visit your vet if you notice : [substeps] Squinting irritation blockage of the eye. This is the case with retinitis, which causes squinting.

Ex Output:
A

Ex Input:
[header] How to maintain a long distance friendship with your best friend [title] Text your friend/s every day and ask them how are they doing. [step] Ask questions about their life, like their school, work, or relationships. Even if they've made new friends, try to always support them by giving advice and talking about their problems. <sep> (A) If you don't know them well enough to do this, simply show up at their home every so often to check in on them. If your friend has friends in school, ask them what they're doing and how they're doing. (B) [substeps] If your friend or s seems down or upset about something, try to help them feel better. Making someone feel better can be especially helpful if you don't get along. (C) Always be there for them, and try not to ignore their texts if they text you. [title] Call your friend (s) often and try to always sound cheerful when they answer your call so, they won't get bored while talking to you. (D) By spending time together, your best friend will have a sound head start and you'll have a much stronger picture of where their perspective is once they begin the friendship. [substeps] You can also be involved in daily study sessions where you can chat regularly.

Ex Output:
C