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 man is seen shooting a bow and arrow followed by another man taking a bow and aiming. Another man is seen kneeling down before bows and speaking to the camera. he <sep> (A) clips a man on the arm and leads into a shirtless man releasing a arrow. (B) speaks more and pictures of him hitting the arrow in the bow while another draws closer with arrows. (C) points to various boxes and continues looking into the camera and speaking. (D) then approaches another man and starts shooting arrows down him.
Example Output: C

Example 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.
Example Output: B

Example Input: [header] How to use a vaporizer [title] Talk to your healthcare provider about your needs. [step] Your doctor will discuss your symptoms, if any, as well as any environmental concerns about your home. They will also offer advice about appropriate next steps, like a vaporizer or humidifier. <sep> (A) [substeps] This isn't a healthy concern for your general health, but also for your general physical health. A doctor can write you a detailed meal plan before taking you on a vaporizer or humidifier. (B) [substeps] Sufferers of acute (short-term) respiratory illnesses, such as cold, flu, or bronchitis, might find temporary relief of symptoms while using a vaporizer. Those with chronic respiratory diseases may find a vaporizer useful, though your healthcare provider may recommend more specialized devices. (C) [substeps] Your healthcare provider should also be able to provide you with plans for your uses and shifts at the pharmacy that allow you to make certain lifestyle changes. [title] Take a capsule or a liquid capsule. (D) [substeps] Talk to your doctor about all the different vaporizers available in your house so you know what is allowed to be used in your home. At some point, you may need to determine who is going to use your vaporizer for what, usually an hourly wage amount.
Example Output:
B