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: Consider Input: [header] How to clean a plastic water tank [title] Open the outlet valve or tap. [step] The first step to cleaning your tank is to empty all of the water from it. To do so, open the outlet valve or tap at the bottom of your tank and let all of the water flow out. <sep> (A) [substeps] You may find that there's extra water in your tank that you need to empty. Read the instructions carefully to see if your water is full enough to remove. (B) You will have to remove several pieces of tank flooring to access one. For the best results, take the steps above. (C) Then, use a bucket to wipe the water down away from the water line, then gently empty the tank contents into the toilet. [substeps] You should also clean the water tank once every few months to keep it clean. (D) [substeps] Connect a hose to the open valve in order to direct the water to a location where it will not cause any localized flooding or erosion. Permanent water tanks have a washout valve that is located at the base of the tank.

Output: D


Input: Consider Input: [header] How to make a cow cake [title] Shape the cakes. [step] You'll need a head, nose and ears to form the cow cake as a whole. Prepare each cake as follows : [substeps] Trim around the top rim of the smaller cake. <sep> (A) Then cut a crescent shape from one side. You should be left with a slightly off-centre oval shape. (B) Pinch the top rim of the larger cake closed. Make sure that the top rim is lined with icing. (C) You'll want to end up with six cakes. If you want a bigger cake, place the smaller cake on your table or set it on the rack. (D) Cut two holes around the circumference of the bowl side. Make a circle inside the side of the smaller cake.

Output: A


Input: Consider Input: [header] How to help prevent nuclear war [title] Show up to town hall meetings, if applicable. [step] If you have the opportunity to go to a town hall meeting in your city or town, use this as a chance to voice your concerns about the threat of nuclear war. The representatives at this meeting will be able to hear your message, as well as others attending the town hall meeting. <sep> (A) [substeps] Prepare what you're going to say before attending the meeting. Use the information you gathered in your research to support your argument. (B) [title] Discuss program issues if conditions or passions stop your ideas. [step] Discuss local issues that you are worried about and what is causing them. (C) [title] Help to make cleanup less disruptive to the surrounding environment. [step] You don't have to let the public know about the threat, of course. (D) [substeps] Make sure to introduce yourself and outline your cause. For example, say something like, " i'm a citizen of america and i want to help in the developing world.


Output: A