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 test if a dish is microwave safe [title] Fill a cup with water. [step] To test if a dish is microwave safe, you can put it in the microwave with a cup of water. Find a glass or cup that is microwave safe, and fill it three-quarters of the way with water. <sep> (A) There should be a line of water running vertically through the dish. [substeps] If the water line isn't a line of water, there is one water that runs vertically from the microwave to the kettle, and this line should be marked. (B) [substeps] Make sure the glass you use is microwave safe. The microwave may take a few seconds to heat up properly, so make sure you're up when the microwave starts. (C) Then, fill the remaining half with water. If it doesn't overflow, the water is safe to place into the microwave. (D) [substeps] It's important to use a cup that you know to be safe for the microwave, otherwise the test may not work. To be certain, find a cup that has the microwave safe stamp on the bottom.
Output:
D