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 find the number of a blocked call [title] Get an private branch exchange (pbx) account. [step] One option is asterisk, a free, open source software. Another is switchvox. <sep> (A) This will also work better than 200 blackwire. If you buy one, it will work with the same account ($ 0.11). (B) The pbx is considered to be a free exchange. While this service typically does not have much use for a desktop account, it gives you access to many anonymous call accounts. (C) A pbx converts your computer into a telecommunications device and will allow you to manipulate incoming call data to identify blocked callers. [substeps] Before embarking on this method ensure that you thoroughly understand the technical challenge it presents and the potential financial burden it incurs. (D) Without switchvox here you are on better business. No other option is available to get a contact number from an online website.
Example Output: C

Example Input: [header] How to turn jeans into shorts [title] Choose a pair of jeans to turn into shorts. [step] The best jeans to choose will fit you comfortably in the hips, butt and thighs. Remember that baggy jeans will become baggy shorts, and tight jeans will be tight shorts. <sep> (A) [substeps] When choosing jeans, choose pair that are relaxed and nice-looking, rather than tight. Skinny jeans work well because they're so baggy and let in some of the heat. (B) Look at the weather forecast when deciding if jeans should be combined into your plan. [substeps] Below are just a few good brands of jeans. (C) Focus on wearing the right type of jeans to avoid huge setback. A snug fit makes them difficult to stretch on the knees, butt, and thighs. (D) [substeps] Jeans made with stretchy material are not the best candidates to turn into shorts. They usually have pieces of rubber or plastic woven in with the fabric, and those won't look good dangling from the bottom of the shorts.
Example Output:
D