Definition: 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 remove sweat stains from sheets [title] Fill a basin or sink with hot water. [step] You can use a bucket, bathtub, clean kitchen sink, or any other container big enough for your sheets. Make sure that there is enough water to completely cover the sheets. <sep> (A) [substeps] The water should be about three-quarters of the way full so that the sheets have room to stand up before you dunk them. [title] Submerge your sheets in the hot water. (B) [title] Add a scoop of oxygen bleach or borax to the water. [step] Read the instructions on the side of the box for exact measurements. (C) [title] Submerge your sheets in the water. [step] Place your sheets on top of the water, making sure to cover them with both of your towels. (D) [substeps] Test the temperature of the water in an inconspicuous spot on the sheet so that you can test the temperature of the water and make sure it is not scalding hot. Do not use taps or other agitators to water your sheets.
Output:
B