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 install custom firmware [title] Record the router's model and version number. [step] These numbers are usually located near the manufacturer's logo, underneath or in back of the router. Write down the model and version information for future use. <sep> (A) [substeps] If you are using windows xp (default operating system), the model number can be found in the start menu under " system settings. " skip all the discussion menus, and then go to system preferences. (B) [title] Obtain the router's ip address and default gateway for your computer system. [substeps] Determine the ip address and default gateway for a pc. (C) [substeps] " w " with the green background is the serial number for the model. " p " with the red background means " unhappy operating system. (D) [substeps] It is easy to determine what operating system is running on your router if you don't know the model. Copy the model from the registry to convert it to your operating system.

Output: B


Input: Consider Input: [header] How to use memes on facebook [title] Log into your facebook account. [step] Go to facebook, and if you're not logged in yet, enter your registered email address, or username, and password in the top right fields. Click " log in " to continue. <sep> (A) [title] See all the memes in the top left section. [step] The memes you want to edit are listed below. (B) [title] Use the appropriate heading to search for memes. [step] In the upper-right corner of the page, you'll see a drop-down menu. (C) [title] Click the update status box at the top of the page. [step] There's an update status box at the top of your facebook news feed and timeline. (D) [substeps] If you haven't signed in yet, you'll need to give the sign in process a shot. Click the " sign in " button in the upper-right corner of the screen.

Output: C


Input: Consider Input: [header] How to run in the honolulu marathon [title] Learn about the requirements. [step] While most marathons have a qualifying time, the honolulu marathon does not, and a great starter for first-time marathon runners. [title] Register and pay for the entry fee. <sep> (A) [step] There is no fee, although most runners pay in installments. This is usually a percentage, which you can get from the facility where the marathon occurred. (B) [step] Most marathon participants have to pay for an entrance fee, or $8.78. [substeps] Some marathon runners may choose to pay the entry fee up front, while others may choose a sliding fee of $35 to cover the 8.78 entry fee. (C) [step] Hawaii residents have two advantages to the marathon: early registration date notifications and lower entry fees. There are separate entry fee amounts for hawaii residents, united states residents, and international residents. (D) [step] You will need a learner's permit to run. These permits are provided by the organization in which the marathon takes place.


Output: C