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".

Ex Input:
A large dog and two small dogs are walking. Two of the dogs are tied together. a woman <sep> (A) walks next to them holding a leash for the other dog. (B) gets the dogs racket. (C) walks up to the dogs and ties their hands behind their back. (D) is trying to free the others, so one falls power washing.

Ex Output:
A

Ex Input:
A woman in track pants and her daughters wash a small dog with soap and water in a bucket on a patio. a woman <sep> (A) uses a cup to pour water on the dog to remove the soap. (B) runs down a track and jumps into a sand pit, then a little girl takes her turn jumping into the sand pit. (C) is kneeling on the grass on a small tilled field, holding a sapling. (D) goes out to interview a dog person on a patio patio.

Ex Output:
A

Ex 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.

Ex Output:
A