Detailed Instructions: 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".
Problem:[header] How to get potassium nitrate [title] Make your way to a local drugstore or pharmacy. [step] You'll have the most luck finding potassium nitrate supplements at a store that specializes in body building supplements, like gnc. Potassium nitrate is sometimes used for athlete enhancement. <sep> (A) [title] Pay attention to the color of your urine. [step] If you have a pale urine, have a cloudy urine, or experience frequent vaginal urination, potassium nitrate is a good substitute. (B) [title] Locate the supplements section if you've gone to a pharmacy. [step] If you're in a pharmacy or drugstore, go to the supplements section and look for a potassium nitrate supplement. (C) It works mostly on food and is not difficult to get. [title] Open a package of your potassium nitrate. (D) [title] Don't confuse potassium nitrate with a regular natural substance. [step] Potassium nitrate is found in many products.
Solution:
B