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".
Input: [header] How to make dog shampoo [title] Wash your dog with dish soap, vinegar, and glycerin. [step] A simple, all purpose dog shampoo can be made using one cup of dish soap, one cup of apple cider vinegar, and 2 ounces of glycerin. Glycerin is a form of sugar alcohol you can purchase online or at a drug store. <sep> (A) It will really help with greasy dog hair. [substeps] When using this shampoo, make sure to combine cup vinegar with 2 ounces of glycerin. (B) [substeps] Mix one teaspoon of all purpose dish soap with one quart of warm water. Stir this mixture of tea tree oil and apple cider vinegar into a bowl of warm water. (C) [substeps] Do not use human facial cleansers as the ingredients in your dog shampoo may repel harmful bacteria. [title] Use pure dog shampoo and warm water. (D) You will also want jars to mix your shampoo, and an empty shampoo bottle to put it in when you're finished. [substeps] Pour all your ingredients into a jar, making sure to pour the dish soap first.
Output:
D