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: A man is seated cross legged watching a show. A man is kneeling in front of the crowd, talking. he <sep> (A) continues talking as the crowd is enraptured, listening to his every word. (B) is recording himself as he talks, getting himself ready and keeping his form. (C) talks as the man rinses the machine with soap. (D) speaks while perusing the music.

Output: A


Input: Consider Input: [header] How to treat feline acne [title] Look for small, black spots. [step] Typically, these acne lesions are found on a cat's chin. The spots (blackheads or pimples) are small, firm and black. <sep> (A) [substeps] There are also five small, brown spots. These pimple-like areas are usually painful and can become sores from acne. (B) If you stroke him just under the chin, you'll notice that the skin feels gritty. [substeps] While acne is usually found on the chin, your cat may also have acne lesions above his lip. (C) They are also located on the skin behind the ear (in the upper jaw). The red spots, however, are small, dark and superficial. (D) The additional lumps do not appear immediately, but they increase in size with age. Look for any dark spots on the chin, a white raised scar that lines the hairline, and a few small craters that look like bumps or scars.


Output: B