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 reinstall and obtain all of the drivers on a dell studio xps [title] Locate your windows 7 install disc. [title] Insert it into your drive. [title] Turn your machine off. <sep> (A) [title] Check the cd case to see if you have any discs that you need. [step] If they are missing you can use the " remove disc " installer. (B) [title] Reboot your machine and immediately start tapping f2 which will take you to the bios setting screen. [title] Use the arrow keys to select the boot tab and press enter. (C) [step] Do this 1 right on the computer from left to turn it off. [title] Go to programs manager and start programs' " disk cleanup " wizard. (D) [title] Take your hardware manager from your pc and open usb-and usb cable from your hardware manager. [title] Connect the power strip to the support tube and then right-click on the cable.
Example Output: B

Example Input: A person is standing in the bathroom with a green and yellow glove on their right hand and begins cleaning the sink with a sponge. a man <sep> (A) kneels down next to the sink dabbing at the faucet and then sprays the man with a spray head solution. (B) points the back of the let the woman clean and it cleans her empty bath tub. (C) then appears in what seems to be his bedroom and begins playing the guitar and the video then goes back to the person cleaning the sink. (D) kneels down in front of a sink full of beige clothing and begins grooming the foot of a dog on top of it.
Example Output: C

Example Input: [header] How to compost horse manure [title] Select a site. [step] Find a place on your property that is on high ground. A compost pile that is too low to the ground will become damp easily. <sep> (A) [substeps] Make sure to prime your compost pile regularly. It should be ready within six to 12 weeks before you plan to compost and bearing in mind that soil changes every month, and soil changes everyday. (B) You also want to make sure that the area is close to your horses' stalls. The closer the spot is to the stalls, the easier it will be to move the manure to compost pile. (C) [title] Choose the right type of manure. [step] Your compost pile can be found next to a sign indicating the type of manure you will compost. (D) If your area is muddy, your manure will melt as it cools so a rootstock pile may not be necessary. [substeps] If the area is already well-drained, you will likely just need a large container.
Example Output:
B