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 buy a blackhead remover [title] Learn your options. [step] You should not squeeze or pick at blackhead, as this can lead to infection or scarring. However, you can remove pesky or unsightly blackheads with several different types of products that may not necessarily irritate your skin or require treating it with chemicals. <sep> (A) Learning your different options can help you identify the best product for your specific blackhead removal needs. Products that can remove blackheads include : [substeps] Extractor tools pore strips clay masks topical creams [title] Identify the best remover for your skin type. (B) For example, cleansing a burnt face can peel pores, like blackheads, and subtly remove blackheads. Deep pore pimples, which are a common factor for blackheads, are not tended to dry out. (C) [substeps] Avocado, keratin, and brewer's yeast all work well in reducing the inflammation and scarring of blackheads. [title] Pick a chemical neutralizer for stubborn blackheads. (D) Some of the well known brands that are known for their blackheads include tootane, steam, huawba, and celandine. As noted above, these products are more environmentally friendly than other skincare products, especially for those kids.

A: A
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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
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Q: [header] How to curl hair [title] Heat up the curling iron. [step] Most curling irons will need about 1-5 minutes to heat up before you can use them. If you try to curl your hair with the iron before it reaches the correct temperature, the curls will not hold. <sep> (A) [substeps] It's important to try to use a medium-to high heat setting, or else you may electrocute your curls. If you do not have the help of a manual curling iron, you can use another curling tool, such as a hair straightener, to find the proper heat temperature. (B) [substeps] Some curling irons will have different settings which you can play around with until you achieve the best result. Try to keep it at the lowest temperature possible though, to cause less damage to your hair. (C) [substeps] Check your curling iron's temperature even if it says to " about 1, " then you'll need to make a quick check-up before if you want to squeeze out all of the curls. [title] Scrunch your hair into a loose spiral. (D) Think about this: the curling iron will hold hair in place for a little longer if you use it very little. If you have thick hair, use 1-2 minutes of heat.

A:
B
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