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". 
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Question: [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.

Answer: C


Question: [header] How to research the market before launching a product or service [title] Start by doing some qualitative market research. [step] You can do it with an agency or on your own. You only need few people (between 5 and 10) from your target market (potential customers) so it is possible to diy. <sep> (A) [title] Don't expect to work in a large company. [step] Meet people for a coffee, greeting and perhaps the business plan or abstract of a product you just started. (B) It can be very helpful to have people assisting in the research so you don't become too particular. [title] Conduct an analysis of the food, drug or cheese market. (C) The only important thing is not to choose some people that you know. This qualitative research has to be done in an objective and neutral way. (D) [title] Gather information in an essay, packet, card, book or letter. [step] This will help keep the reader engaged.

Answer: C


Question: [header] How to sculpt a dolphin using clay [title] Set out wax or parchment paper. [step] Find a picture or a photograph of a dolphin on the internet and print it out. If you don't have a printer, try to draw the design or trace it off the computer image or from a book image. <sep> (A) You can also cut the shape out and then lay the wax over the design on the paper. [title] Attach the rounded sides of the arms and legs together with hot glue. (B) Then paint it on, depending on what you want. Wax and parchment paper works especially well for sculpting small dolphin sculptures or swirling figures. (C) [title] Purchase air-dry or oven bake clay. [step] Try to mold the clay flat onto the picture as well as you can. (D) You can even wet draw it with wax or parchment paper on a piece of cardboard or newspaper. [substeps] A common mistake you can make is that it's not as durable as sandpaper.

Answer:
C