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".

[Q]: [header] How to have healthy kidneys [title] Stay hydrated. [step] Staying properly hydrated is one of the best ways to keep your kidneys healthy. Without adequate water, your kidneys can lose some of their ability to filter your blood, and may even become damaged over the course of your lifetime. <sep> (A) [substeps] Drinking water helps your kidneys flush sodium, urea, toxins, and waste out of your body. By staying properly hydrated, you can significantly reduce your risk of developing chronic kidney disease. (B) Aim to drink at least 8 fluid ounces of water every day. This will help reduce any additional fluid or waste in your system and will also allow you to more easily relieve the symptoms of kidney problems. (C) Insufficient water will contribute to poor kidney function, such as kidney failure and rheumatoid arthritis. Trying to drink water with no filter might cause further kidney damage. (D) [substeps] The best amount of water recommended by experts is 1 gallon a day (2.5 liters) each. Drink bottled water, but you don't need soda, fruit juices, or other non-carbonated beverages; opt for bottled water.
[A]: A

[Q]: [header] How to find out if a good friend is crushing on you [title] Pay attention to their posture when you're around. [step] If your friend is crushing on you, their body language will probably be more open, and they will usually stand with their body turned towards yours, even in a group. [substeps] If your friend has a relaxed posture, with their torso facing towards you, it's a sign that they feel at ease. <sep> (A) If their shoulders are hunched, they may be pressed against you. If they'll just stand in silence, it's a sign that they're not interested. (B) It may mean they like you or it may just mean they are comfortable being around you. Watch for signs that your friend's posture has changed around you. (C) They may also be putting down their phone or tapping their feet. [title] Observe how they look around you when talking to others. (D) They may look up at you a few times throughout a conversation and nod or smile occasionally to show that they trust you. [title] Pay attention to their general body language.
[A]: B

[Q]: [header] How to survive and enjoy being an expatriate [title] Know what to expect. [step] Make sure you research your new country. You will want to know all of their customs beforehand, so you don't accidentally make a cultural gaffe while you're there. <sep> (A) Learn about everything which an expat will teach you before planning a trip to the country. [title] Draw up a business plan with the expat. (B) Become very familiar with their food, art, lifestyle, national pastimes, and maybe even a bit of history if you're interested. And if the language spoken there is one other than your native one, for goodness' sake make sure you are able to speak it, at least passably. (C) It is important that you are prepared to navigate the christmas customs in the u.s. however, you might consider hiring an ironing professional to show your way out of it. (D) Know what your embassy or consulate will offer in terms of food and supplies. You should have everything you need before you start consulting with you future employer.
[A]:
B