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 woman stands behind a bar and talks to the camera. The woman then takes a glass an puts it on the bar. the woman <sep> (A) screws a cocktail shaker onto a lemon wedge and pressing the lemon wedge back and forth. (B) begins making a cocktail. (C) takes a bucket and turns it upside down. (D) then pours liquid into the glass with ice after.
Example Output: B

Example Input: People are playing a game where they hit a ball with a stick. A man is seen sitting on the grass behind a goal. a m an <sep> (A) couple is standing next to the goal area. (B) a segment has two men standing before him holding a ball. (C) is holding a bottle and a pitcher of juice. (D) a little girl runs and throws the ball to a man sitting on the grass.
Example Output: C

Example Input: [header] How to change strings on an electric guitar [title] Change your strings when they are rusty, gummy, or falling out of tune quickly. [step] If you're a serious guitar player you'll be changing your strings frequently, and some musicians change weekly. If your strings feel slow and sticky, or you have to re-tune frequently, you're due for new strings. <sep> (A) If you haven't restrung in 3-4 months, get new strings. [substeps] If you're about to play a big gig, change the strings that morning to prevent unexpected breaking. (B) [substeps] Always re-fret for better sounds, and get replaced often to prevent dropping strings or flying out of tune. [title] Replace the strings that fall out right after you've played. (C) [substeps] Before you begin switching your strings for an electric guitar, make sure you've checked the strings yourself and have signed a contract that says how long your strings will last. These clauses apply to any electric guitars you happen to buy. (D) Ask your guitar shop or guitar retailer which strings they'd recommend in determining the proper route. [substeps] If your strings are particularly dirty, you may want to replace them with new strings or fresh strings.
Example Output:
A