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 visit a jewish ritual bath [title] Speak to a rabbi or other authority competent in jewish law prior to using a mikvah. [step] While not a requirement, they can offer helpful advice and answer any questions you might have. [title] Understand the rules of a mikvah and how it works. <sep> (A) [step] Mikvah is private, and meant to be used only when washing a body and body. Mikvah can take up to 20 days in a week. (B) [step] The mikvah is constructed under very strict rules, and the water typically comes from a natural source, like a spring or even rainfall. [substeps] The mikvah is used mostly by chasidic and orthodox jews, though any jewish person may use it. (C) [step] Mikvah baths are prescribed for 10 days (7 days for girls and 16 days for boys). Mikvah baths are not ceremonial, and may come in either a 3 day or 4 day cycle, depending on your religious heritage. (D) [step] You can also create a small bathhouse already prepared to accommodate a children's bath, but you can also have a fancier bathhouse if you have the space and your budget permits. A mikvah is a fiduciary space whose functions you and your child can perform together.
B