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".

Ex Input:
[header] How to change trackpad settings on macbook pro [title] Find the system preferences. [step] Starting from your main desktop screen there are two ways to find the system preferences where the mouse and touchpad settings will be located : [title] Bring your cursor to the bottom screen and find the system preferences application. [step] The icon looks like a box with three gears inside it. <sep> (A) Open that to find all your system preferences. [substeps] Alternatively, you can use the spotlight feature. (B) On macbook pro this icon resembles a round blue square with a horizontal green dot on it. On other applications this icon is actually a box with a gear, and is small in appearance. (C) It can be located on the taskbar or in the upper left-hand corner of the window. [title] Let the system preferences application perform its work. (D) [title] Click the customize key in the dialog box. [title] Follow the on-screen instructions to change the customization function.

Ex Output:
A

Ex Input:
[header] How to love reading [title] Consider why you want to read. [step] People read for a wide variety of reasons. Before you pick up a book, consider what you want to get out of reading. <sep> (A) Some people like reading books that teach them new skills, from computer programming languages to skills for hunting or camping. Other people enjoy narratives, whether fictional or biographical, to transport them to other times, worlds, or situations. (B) Maybe you want to learn how to read to overcome your depression, or maybe you want to learn how to fix the problem you have with your previous reading. Identify, by reading, why your brain is going through a few different positions and see which position you are thinking about reading in. (C) Are you concerned about losing weight? Good books can have a much greater impact on your emotions, yet the answers to most of your questions are still unknown. [substeps] Do you want a great book in mind? Like many writers, you may have been hoping a novel could express a feeling of still love while taking care of your children. (D) [substeps] You can visit your local library, read at a coffee shop, or do some more reading. You can also read online if your websites want you to read.

Ex Output:
A

Ex Input:
[header] How to date a nerd [title] Don't assume disinterest. [step] Nerds often have social anxiety. They might ask questions to keep the conversation going, but become so worried about what to say next that they don't listen to your answers. <sep> (A) Embrace uncertainty or shyness in your interactions. If someone starts talking about himself or herself you may not understand him or her. (B) If you suspect a nerd is interested in you, you may want to step back away from the conversation. If the subjects don't seem to be going well, excuse yourself for a moment to take a break. (C) [title] Try picking a nerd that you genuinely like. [step] Nerds aren't afraid to try new things. (D) [substeps] Give the nerd time to open up to you. They'll be better at listening once they feel more at ease.

Ex Output:
D