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".
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Question: [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.

Answer: A

Question: [header] How to dry a dog [title] Allow the dog to air dry naturally. [step] This is the easiest and most enjoyable way for the dog to dry. After getting wet, the natural reaction of many dogs is to shake from side to side with great vigor to release the water. <sep> (A) Dry the dog by waving a towel near the dog and holding it in front of him as you shake. Dry dogs naturally shake after an accident, while dirty dogs are especially prone to shake from side to side. (B) This helps air to flow through the dog's body and speeds the drying process. [substeps] Letting your dog dry upside down with its chest out can help with this. (C) In less than 4 seconds of shaking, dogs can shake up to 70% of the water from their fur. [title] Stand back and allow the dog to shake the water from his or her fur. (D) To encourage this, your dog has to naturally dry themselves faster because you are taking a short nap before allowing him to dry itself. [substeps] Wait until after a shower or bath to air dry your dog.

Answer: C

Question: [header] How to play sepak takraw [title] Set up the court. [step] The court is rectangular and measures 13. 4 meters by 6.1 meters, approximately the same size as a badminton court. The net is in the middle of the court and should be 1.52 m high. <sep> (A) [substeps] The court runs on one side of the lower part of the court. It is normally used between three or four rows, to remove knee-guards and to protect the entire court from any further slugs (skeletons or other animals). (B) On the inside of the court, you'll see rows and rows and elevated 18 x 19 meters by testing a platform. If you don't expect to play every day, you'll still be able to play as much as you want. (C) A service circle should be drawn 3.05 m from the back line and 2.45 m from the sidelines. The radius of the service circle should be 0.3 m. (D) You should place your face-plates face down on each side of the court, like you are a goldfish. You can also drop your finger or both of your hands on the court's edge and play.

Answer:
C