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 clean a vornado fan [title] Clean out dust in the outer grills using a vacuum cleaner brush. [step] You can use a brush attachment on a vacuum cleaner to clean out all of the dust from the outer grills. Make sure the fan is unplugged before vacuuming. <sep> (A) [title] Place a cleaning rod in each section of the fan and squirt some cleaning fluid through each rod. [step] Avoid getting any grease in the vents or rest tray. (B) Some of the cleaner should be removed from the outside if you use a cloth and brush as cleaning instructions are laid out in the manual. [substeps] Avoid cleaning the outer grills with dust because it can detach some of the insulation and contribute to the fan's cooling. (C) Wipe down the inside of the cover every few minutes so you can put the fan back together. [substeps] For maximum efficiency, you should wash your vornado fan at least once a month, which is right after each dry run. (D) Go slowly when vacuuming to ensure you clean out as much dust as possible. [substeps] This will only clean the outer part of the fan, not the inside blades.

Output: D


Input: Consider Input: A group of people are in a gym playing dodgeball. a logo <sep> (A) appears and clears the tiles. (B) representing dartmouth appears, followed by other words. (C) appears on the screen. (D) shows up with arrows.

Output: C


Input: Consider Input: [header] How to clean a keyboard [title] Shut down the computer and detach the keyboard connector before any cleaning procedure. [step] Do not remove or connect a keyboard while the computer is running. Doing so may damage the machine if you have a non-usb-based keyboard. <sep> (A) Detaching the keyboard while the computer is running is safe when the keyboard is connected to the computer via usb. [title] For a quick cleaning, turn the keyboard upside down and use a can of compressed air to blow out any foreign matter. (B) This could cause a paperclip message from the owner of the computer to stick on the keyboard, triggering a crash. In the event that you have a problem with the keyboard by the end of the cleaning process, remove the keystem connector from the computer. (C) [title] Remove the component cover from the motherboard. [step] Remove the old component to access the new component. (D) Attach the other end of the wire to the original keyboard connector. Use the same type of wire that you took off the previous year's keyboard connector.


Output: A