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 add potassium to an organic garden [title] Mix in muriate of potash or sulfate of potash. [step] Muriate of potash, or potassium chloride, and sulfate of potash, or potassium sulfate, are natural minerals. Muriate of potash tends to be cheaper, but the chlorine it contains can hurt the helpful microbes living in your garden's soil. <sep> (A) Gently mix these two together first, then add the zinc sulfate. [substeps] Zinc sulfate is readily available online, or in desalination solutions. (B) [substeps] You can substitute sodium thiamine (ipsin) or baking soda for sulfate because it is the most acidic fertilizer. Sodium thiamine is a common fertilizer in agricultural and organic gardens. (C) Sulfate of potash is safer, but it's a bit more expensive. [substeps] Check your product's label for specific instructions on how much to add per square foot or meter. (D) [substeps] There are many ways to add potassium to soil: you could use the most common method. You could sift the potassium into an empty feed colander and cool it before dropping it off.

Answer: C


Question: [header] How to get into a good secondary school in england [title] Prepare by learning about the schools. [step] Around september to october of the year before you hope to join the new school, you'll want to go to open evenings or open days. These are evenings where the school is opened especially for prospective students to visit the school and take a look around. <sep> (A) Attending these events will give you access to knowledge about the school, find out how to study there, and see what the schools do on the weekends. [title] Break into the traditional role of the school counsellor. (B) You should also prepare by gaining experience in a specific school. These skills can help convince your parents and friends that you fit into a good secondary school. (C) [substeps] The website of english schools in scotland is a good place to start. There are websites specifically dedicated to english secondary schools in scotland. (D) [title] Attend as many of the open evenings as you can. [step] Make sure you organise the dates and get to the evenings with plenty of time to look around-you don't want to be rushed.

Answer: D


Question: [header] How to oxidize a gummy bear [title] Wear eye protection (goggles or lab glasses), a lab coat, nitrile gloves, and a face mask. [title] Wear pants that cover the entire leg. [substeps] Shorts or skirts are not acceptable. <sep> (A) Understand that if you intend to cook your bear, you must wear either pants, skirts or leggings in preparation. [title] Cook on high heat for 20 minutes and add one tablespoon of soy sauce. (B) Avoid denim, since it can dull the coloring if you use this very often. [title] Put a shoe or step onto the inside of the can, this will open up more vapor. (C) A pinwheel enthusiast does not wear any shorts. [title] Cover the hands with plastic clamps. (D) [title] Wear only closed toed shoes that cover the entire foot. [substeps] Sandals or open-toed shoes are not acceptable.

Answer:
D