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". 

Example Input: A woman cleans a cafeteria floor with a mop while occasionally talking to the camera. the woman <sep> (A) uses a mop on the floor under her chair and in a bucket. (B) uses the mop around the tables and some seating areas as well as around fork corners. (C) uses a mop nozzle to clean the floor. (D) walks to and cleans a different part of the cafeteria floor.
Example Output: D

Example Input: [header] How to be happily married [title] Don't expect your happiness to be derived from someone else. [step] The most common mistake made in the quest for a happy marriage is to expect that someone should be " making " you happy. The old saying " to have friends requires one to be a friend " applies. <sep> (A) Regardless of whether your happiness is due in some sense to someone you love or something to do with your own, you should hear and be happy. [substeps] Two people don't get married just because there is someone else there to provide love and companionship. (B) Refrain from assuming that your friends and family love and care for you. In fact, expectations for your happiness are far from accurate. (C) If someone is what you expect them to be, try to be a " friend " with them. They will likely be incredibly happy when they express their true love, and please, observe them for a moment before delving in deeper. (D) [title] Focus on how you can make the marriage happy. [step] The only way you can be happy is by focusing on your own efforts to make your marriage partner happy.
Example Output: D

Example Input: [header] How to clone yourself on a youtube video [title] Create a video on a video device. [step] Use props that are large enough to fit about double or longer sections of yourself inside the shot. [title] Position your camera, in only one place. <sep> (A) [step] Placing the camera on a tripod won't do at all, your real screen will be doctored and you'll be missing the important moment. You also won't be able to look down at the video you're making or press " home " button in order to end filming. (B) [step] For example, in that person's bathroom, put your camera directly on the toilet seat. Imagine that in their bathroom, there's a 1 ant under the toilet seat. (C) [step] Try not to spend too much time in one location, or else the smell will permeate your video instead of where you would like it to be. Get a maximum of 3.25 mm length. (D) [step] Make sure it has absolutely no breezes or any way to knock the camera around. If your device has a remote-controller, consider bringing it with you when taping.
Example Output:
D