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 buy a wood burning stove [title] Consider your heating needs by evaluating the size of your home. [step] You will need to determine the heat load necessary to maintain the square footage of the area you want heated. Heat load is measured in btus, or british thermal units. <sep> (A) Inquire about btus and thermal units using online resources. [substeps] Btus heat packs can be found at home improvement stores, department stores, and some gas stations. (B) To determine how much heat you need, pay attention to the dimensions of each room you intend to fire in. [substeps] The larger the square footage, the larger your fire seats will need to be. (C) You will need 25 to 30 btus per square foot. [substeps] Measure each room to be heated with measuring tape. (D) Btus are rated from 2000-1000. Btus can be changed or altered depending on the size of your home.

Answer: C


Question: [header] How to stay young [title] Challenge yourself to try new things. [step] Go out dancing, joining a book club or a hiking club, or try out for a community chorus. Singing, dancing, and finding new ways to stay active all contribute towards keeping a youthful outlook on life. <sep> (A) Here are some things to take into account : [substeps] Spend less time studying or practicing. Read only the books you are interested in, do not read video games, and do not browse old magazines or websites. (B) [substeps] Don't be afraid to laugh at yourself. Trying new things with joyfulness raises your levels of dopamine and energy levels. (C) [substeps] Try a fun game like punch or catch. Then, in the morning, you'll feel fresh and energized, and all your racing thoughts will be washed away. (D) If you can, challenge yourself to put in hours or weeks into each of these activities. Try hard but don't give up if you cannot help someone in need.

Answer: B


Question: [header] How to feed a pregnant or nursing cat [title] Switch your cat to a wet kitten food. [step] Towards the midpoint of your cat's pregnancy, begin switching her onto a high-quality wet kitten food. Kitten food contains higher percentages of nutrients and vitamins than do adult cat foods, and will provide the queen with more of the protein and calories she needs during pregnancy. <sep> (A) [substeps] Keep in mind that your cat's food consumption will increase during pregnancy. She'll usually eat about 50% more than she would when not pregnant. (B) [substeps] Kittens are at the peak of production because of that. If she loses weight, but stays healthy, the larger the portion of that food she eats, the better (approximately how long she will stay underweight). (C) [substeps] If your cat couldn't have a dry cat food, you may have to come up with an alternative. Don't restrict your cat to a wet or kitten food diet. (D) You should start feeding your cat frequent cat food at around one to two weeks of age. During this time, you should make sure she is getting the nutrients she needs, including iron, potassium, or calcium.

Answer:
A