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 man sitting on a bucket by some snow drinks a beer. He speaks to the camera. he <sep> (A) is shoveling the snow. (B) is shown running around a field demonstrates how to do curling. (C) puts down his beer and grabs a fishing pole and begins to fish. (D) holds a bottle of vodka when drinking the beer.
Example Output: C

Example Input: [header] How to polish rocks [title] Choose the right rock. [step] You can polish any stone you wish, but there are certain characteristics of a stone that will make it easier to polish. If you want an easy stone to polish, pick a somewhat softer stone like onyx, limestone or calcite. <sep> (A) [substeps] You can polish diamond, granite or ceramic stones by cutting thin pipe holes or inserting dry mortar into one side of each hole. Look for a stone that resembles a diamond, but not necessarily a diamond. (B) Otherwise, a smoother, more pumice-like stone will be more difficult to polish. [substeps] Emeralds and equilateral manganese are both excellent mineral polishes. (C) Stones that are very hard will take a much longer time to polish. However, though hard rocks take a long time to sand, they yield more shine than softer rocks. (D) Softer rocks will actually work more well, and might look better to polish very old stones, but brighter stones tend to chip quicker. [substeps] Rubies, sapphires, and emerald are good options.
Example Output: C

Example Input: [header] How to take pictures on ipod touch [title] Open the camera app. [title] Slide the lower right corner bar to the camera icon. [step] By default, the camera is set to the photo mode. <sep> (A) Checking this setting causes multiple changes to the image. [substeps] Turning the camera off can cause another picture to be taken by the same camera app. (B) [title] Press/pause and select the camera you want to shoot from the " timeline " menu. [step] You can adjust the aperture settings (left and right) or take a screenshot from either option-whichever works best for you. (C) This mode is important if you plan to use your camera for photography purposes. [substeps] For example, if you need to take a photo of a family tree, " yay, there you have it " could be used. (D) [title] Tap the larger camera icon (on the bottom tab) to take a picture. [step] To view your photos, tap the small box in the lower left corner.
Example Output:
D