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". 

Example Input: [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.
Example Output: C

Example Input: [header] How to prepare for the gre in psychology [title] Familiarize yourself with the structure of the test. [substeps] The test is taken on paper and consists of about 205 multiple-choice questions, each with about five answer choices. Some questions are grouped together around a graph or experiment summary. <sep> (A) Your final score is scaled and will range from 200 to 800. Two subscores from 20 to 99 ranking your grasp of experimental psychology and social psychology will also be given. (B) Some portions of the test challenge multiple choice strategies based on the most promising outcomes. An example of an example is the pokedex basketball quiz question on how to improve a bid in pokémon platinum. (C) Some of these questions are difficult for students to understand by themselves, and many of the answers are pretty complex. If you're having trouble with the test, you can skip this step. (D) The questions are divided into groups of multiple choices. Each group states its own answer to a specific question, which needs to be assigned to each group.
Example Output: A

Example Input: Woman is walking wearing a bikini and eating a chocolate is snowy day. People are in sidewalk watching the girl walks. woman <sep> (A) is in a restaurant wearing a bikini and two aiter are watching her. (B) is high fiving sesame street. (C) is falling river and is waving to the camera. (D) do wakediving ieds on a pool and a team and stands in front of the far side of the pool.
Example Output:
A