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". 

[Q]: [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.
[A]: C


[Q]: 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.
[A]: C


[Q]: A graphic shows and then photos follow of a girl growing up with horseback riding. Three years after those photos the girl moves and she is shown riding horses. the girl <sep> (A) is shown with other girls posing with some awards for horseback riding. (B) then takes an exercise class and the lady shows her how to ride with the palomino. (C) continuously rides down the country with other riders. (D) is then interviewed by a man and she smiles and claps her hands.
[A]:
A