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". 

Two young children come down the slope in red and black tubes. They come down steadily and smoothly till they reach the bottom of the slope. there <sep> (A) are some other people climbing up the slope with tubes and sledges in their hands. (B) are some people standing near a water drop holding tubes. (C) they sit on the rails and wait for the lift to come before they get off the roller coaster. (D) is an interview with a reporter from the tv station and a news station talking about mountainous terrain and the people who are climbing to the bottom of the hill.
A

[header] How to numb a tooth [title] Take an over-the-counter-painkiller. [step] A painkiller like ibuprofen or acetaminophen should be your first step in trying to numb a painful tooth. These painkillers will alleviate the pain from your tooth, and should also decrease any swelling in the infected area. <sep> (A) [substeps] If you are not able to find ibuprofen, you can opt for acetaminophen instead. [title] Freeze food that contains aspirin. (B) [substeps] Ibuprofen can be applied within 30 minutes to up the duration of an over-the-counter painkiller. Follow the manufacturer's instructions and do not take ibuprofen within 30 minutes after it has been applied. (C) [substeps] Make sure you read and follow the dosage on the packaging. Do not eat anything until told to do so by your dentist to ensure you are following the proper dosage. (D) These are all readily available at your local pharmacy. [substeps] If you're treating a toothache in a child younger than 18, do not give him or her aspirin.
D

[header] How to prune plum trees [title] Prune at the right time. [step] You can prune the tree while it is dormant in winter or in summer. Dormant pruning is pruning the tree during the late winter, when no new growth is happening and the tree doesn't have any leaves. <sep> (A) Pruning while the tree is dormant encourages vibrant growth come spring, and it's less likely to cause damage to the tree than summer pruning. Summer pruning can be used to slow the growth of a tree that is getting too big and to thin new growth that is overcrowding. (B) [title] Wait until the tree is near the height of its dormant season. [step] You might want to wait it out before pruning in winter because the plant will still haven't developed enough foliage to protect it from the cold winter weather. (C) Or, you could, if the tree is off-season, prune it during the summer. [substeps] Wait until after it has dead leaves, stunted branches, or splits in the bark. (D) You can begin to prune the tree in mid-spring just after it has returned to normal size, taking care to remove any dead or damaged branches. [title] Pick a healthy scene for your pruning.

A