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".
Q: [header] How to ash your cigarette [title] Watch where you ash. [step] Before attempting this method, make sure you have an acceptable place to ash. An ashtray is preferable, but in the absence of one you should ash in the sink, in a cup, on asphalt, or a surface that can be easily cleaned. <sep> (A) [title] Put the ashtray away when you're finished and before smoking. [step] If you haven't cleaned your ashtray after that time, carry it out to avoid accidentally recognizing it. (B) Be sure to remove every stain, emery board, or other material you can so that your cigarette doesn't get ink on it. No matches, dry sand, or the like should be used as a replacement material. (C) [substeps] If you see ads advertising this method, you can convince the locals that smoking in a park or some other open area will be easier and quicker than going across a parking lot. This helps prevent and deal with smoking on a lowered scale. (D) Avoid ashing on wood, carpet, tile, or cloth as these will be stained and/or burned. [title] Hold your cigarette steadily between your index and middle finger.
A:
D