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 prevent unauthorized computer access [title] Set up password protection. [substeps] Enable password protection on your computer if it is not already set up. Make sure you are using a personal password you have chosen versus the default password. <sep> (A) When creating your password, be sure to incorporate numbers or special characters to make it difficult for others to guess. Change your password often, at least every 2 months. (B) [title] Ensure no viruses are accessing the computer. [substeps] Disable password protection protected if it is locked. (C) Put some type of recovery code into the bar along the top of the screen, if it is not already enabled. Allow yourself a certain amount of time before attempting to access computer files. (D) This will prevent people from entering your password without permission. [title] Enable online browsing if there is no internet connection.
Example Output: A

Example Input: [header] How to get rid of migraines [title] Learn all you can about migraines. [step] Nobody knows exactly what causes migraines. A lot of research has gone into the exact cause of migraines, but with little success. <sep> (A) People who experience migraines regularly have been having regular consultations with doctors and they still don't know what is causing them. Anything you experience requires some much-needed research or hypnosis to rule out any medical issues or underlying conditions. (B) Migraines result from a lack of sensory focal points or groups. They occur in fewer than three brain groups. (C) Just finding out what causes them will give you some tips on dealing with them. [substeps] Most people develop migraines because they have no symptoms or aren't able to respond to stimuli. (D) It is generally agreed upon that the trigeminal nerve plays a role in migraine pain. The trigeminal nerve is a cranial nerve that facilitates a major pain pathway.
Example Output: D

Example Input: A man splits logs into using an ax in a grassy yard while his wife retrieves the pieces. a man <sep> (A) cuts a log from the ground without using the ax. (B) split logs as his wife retrieves firewood from a hole in the ground. (C) splits logs in the yard by himself. (D) uses the ax to solve the cube on the backyard while his wife steps over to help him.
Example Output:
C