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 Q]: [header] How to tell if a cat has a sore throat [title] Notice a change in the cat's meow. [step] Your cat's meow can help you determine if they have a sore throat. Listen to them when they meow. <sep> (A) You will notice different tones of their meow in different environments. [substeps] A cat with sore throat may meow intensely or complain loudly. (B) Their meow might sound quieter, raspier, or thinner than usual. If there is a change in the way the meow sounds or a noticeable difference in the way the cat sounds, it might point to a sore throat. (C) Cats meow every time they've got a sore throat, at least once or twice a day. You might hear this meow a lot. (D) If they do meow, then your cat has a sore throat. [substeps] Cats meow because they are in pain.
[EX A]: B

[EX Q]: [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 A]: C

[EX Q]: [header] How to paint melamine [title] Use 150 sandpaper to rough up all areas that you intend to paint. [step] Make sure to get sand all areas, including the edge, bottom and detailing. [substeps] Choose a liquid " de-glosser " if you are looking to limit the amount of physical work it takes to finish this project. <sep> (A) If you intend to paint at a more gradual pace, that adds up to roughly 150 minutes to an hour. If you will be painting on concrete, consider to do this on concrete to reduce stress on it. (B) A liquid " de-glosser " is a microsoft paint kit that comes with an anti-stain solution set to air dry. The solution is then removed with a machine or airwash until all visible paint is removed. (C) Pouring fuel into either can build up rust and poorly-positioned filler. [title] Create a solar panel using 290 grit sandpaper. (D) It is a solvent that dulls glossy finishes. [title] Wipe all areas clean with a brush or broom, and then wipe again with tack cloth.
[EX A]:
D