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". 

[EX 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.
[EX A]: A

[EX Q]: There's an artist painting a square canvas board with several acrylic colors using a flat brush in a studio. she <sep> (A) is painting a christmas tree with a piece of acrylic text. (B) moves the brush across the screen several times. (C) shows how to cut the paint with the flat brush when time stops. (D) begins by painting blue strokes with the flat brush on the canvas surface.
[EX A]: D

[EX Q]: [header] How to edit videos on snapchat [title] Open snapchat. [step] It's the yellow icon with a white ghost. [title] Tap and hold the large circle icon to take a video. <sep> (A) [step] Tap and hold a video in this folder. [substeps] If prompted, enter your login email address and password. (B) [step] A pop-up window will appear. [title] Tap and hold the video that you want to edit. (C) [step] Videos can last up to 10 seconds. [title] Release your finger when your video is complete. (D) [step] The video will scroll straight and round to highlight and position a shot. You'll need to crop the shot after the first send.
[EX A]:
C