Given the task definition and input, reply with output. 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".

[header] How to compost horse manure [title] Select a site. [step] Find a place on your property that is on high ground. A compost pile that is too low to the ground will become damp easily. <sep> (A) [substeps] Make sure to prime your compost pile regularly. It should be ready within six to 12 weeks before you plan to compost and bearing in mind that soil changes every month, and soil changes everyday. (B) You also want to make sure that the area is close to your horses' stalls. The closer the spot is to the stalls, the easier it will be to move the manure to compost pile. (C) [title] Choose the right type of manure. [step] Your compost pile can be found next to a sign indicating the type of manure you will compost. (D) If your area is muddy, your manure will melt as it cools so a rootstock pile may not be necessary. [substeps] If the area is already well-drained, you will likely just need a large container.
B