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: [header] How to download microsoft office 2010 [title] Visit the office 2010 download page. [step] Microsoft office can be legally downloaded from microsoft's website as long as you have a valid 25-character product key. To find it easily, search for " using your office 2010 product key ". <sep> (A) [substeps] If you don't have a csso account, you may have to create one. You will need to verify your identity with microsoft office 2010. (B) [substeps] Office 2010 is no longer available for purchase or as a trial from microsoft. You can still buy boxed copies from other retailers. (C) [substeps] Leave one or more lines between the tabs on the homepage and the window you will be downloading to provide information about what you want to download. [title] Open the primary file you wish to download. (D) [title] Enter the windows code to install microsoft office 2010. [title] Click on the save file to run the pc then re-open microsoft office 2010 now to continue.
Example Output: B

Example Input: [header] How to unblock a toilet when you have no plunger [title] Cover the end of a mop with a plastic bag. [step] Pull the bag over the end of the mop. Then, tie it off or secure it in place with a rubber band. <sep> (A) You can also use a rag or a toilet cloth to help secure the bag if you don't have a mop. [substeps] Try using empty containers to provide more protection. (B) After securing the handle of the mop, throw it away. [title] Turn on the water faucet. (C) [substeps] Discard any waste that falls from the end of the mop. [title] Use the bucket or bowl to catch any urine that spills out. (D) [title] Plunge your toilet with the mop. [step] Use a forceful in and out motion like you would with a normal plunger.
Example Output: D

Example Input: [header] How to use twitter to increase web traffic [title] Create a twitter account, if you have not already. [step] Make sure to put in a picture or logo, and place your website in your short " bio " description. Choose a username that is your website name. <sep> (A) [title] Navigate to the what you are looking for and check what you have posted about your twitter account. [title] Select find an account at the top of the " profile " menu. (B) Twitter is a great way to get started and offer your preferred platforms in the world. You can be found on the much more advanced platforms also, the vimeo bot platforms also are much higher up on both locally and in the norads website. (C) [title] Appoint an experienced social media marketer to handle your twitter account, if you do not know how. [step] The key to the successful use of social media promotion is consistency. (D) Make your name something that interests you but does not make you seem like your twitter account. You can add images, creative and educational content to your website.
Example Output:
C