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 set up your own reference library [title] Clarify your personal mission statement. [step] Most libraries have a mission statement that helps to identify their goals, acquisitions, funding, organization and more. Although this need not be a formal document, it is a good idea to clarify your goals before starting to build a personal library. <sep> (A) [substeps] Write down everything you intend to do with your library when you start. Every purpose has its own location, but your aim is to teach readers that you understand their goals and therefore that they have a guiding guide. (B) [substeps] Before you begin any building/helping-up or convenience, it's a good idea to clear your path to this specific library. The topic will be taught in your own library, and you will be able to understand it and focus on it. (C) [substeps] Research organizations you know or have known for many years and make sure they have original objectives and goals. Consider meeting in person to ask questions, and knowing their expectations of how you will be spending the next year. (D) [title] Develop a reasonable monthly or yearly budget. [step] Unlike city or school libraries that are at least partially publicly funded, a personal reference library relies on your own funds.
D