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".

There is a large decorated christmas tree behind them. There is a woman sitting in the living room with a little girl. the boys <sep> (A) begin to climb hill on the christmas tree with an orange garland and used a brush. (B) play foos ball with the men. (C) are showing the little girl how to pierce her nose piercing. (D) start to play as the woman continues knitting the tree.
B

[header] How to post to a facebook group on pc or mac [title] Go to https: // www.facebook.com in a web browser. [step] You can use any web browser, such as chrome or safari, to access facebook. If you're not already signed in, sign in now. <sep> (A) [title] Click on the downward-facing arrow in the top right corner of the screen. [step] It's at the top-right corner of the screen. (B) [title] Click your profile picture at the top-right corner of the page. [step] You will see your profile picture in the upper-right corner of the page. (C) [title] Click a group to open the group's menu. [step] Click the group on the right sidebar, or the group's upper menu of options. (D) [substeps] You must already be a member of a group to post to it on your computer. See join groups on facebook to learn how to join a group.
D

[header] How to diagnose vertigo [title] Notice dizziness and feelings of imbalance. [step] Primary symptoms of vertigo include dizziness and a sense of imbalance. If you feel as though you are spinning or your environment is spinning, this suggests vertigo. <sep> (A) Both dizziness and imbalance can be separate; however, each of these symptoms have different negative effects on the person's blood glucose balance, nervous system and/or mood. People who experience vertigo in people with low blood glucose balance and who experience vertigo in people who are higher functioning are at risk of developing vertigo. (B) Feeling as though you are going to fall over or being unable to balance yourself also suggest vertigo. [substeps] These symptoms could be caused by inflammation of the vestibular cranial nerve, so it's important to visit your doctor and get a definitive diagnosis. (C) [substeps] Vertigo may manifest itself in small parts of the body such as the eyes, ears, nose, and mouth. Dizziness can change your focus in all directions as well, so it may be a sign that something is going on. (D) [substeps] Lightheaded people may experience dizziness and am lightheaded, while middle-aged women may experience vertigo and may feel that they are dizzy. Vertigo is frequently described as a symptom of motion sickness.
B