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 clean an enamel bathtub [title] Mix hot water and liquid dishwashing soap. [step] Get out a small bucket and pour 2 tablespoons (30 ml) of gentle dishwashing soap into it. Use a dishwashing soap that will cut through grease and grime. <sep> (A) The water should be about 80 to 100% pure, as dish soap is fine for removing grease and debris from enamel toilets. [substeps] Make sure the water is hot enough for you. (B) The water in the bucket must be somewhat dirty so every time you wash dishes, you'll use cleaner or cleanser. [substeps] Machine clean is a good choice as it removes surface dirt and grime that causes rust to build up on your enamel. (C) Pour 1 gallon (3.8 liters) of hot water into the bucket. Stir the mixture until it's soapy and combined. (D) Keep mixing the soapy solution to get soap that doesn't irritate the enamel. [substeps] You can create your own dishwashing soap by soaking your tub in hot water for a few minutes.
Output:
C