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 lance and drain a blister [title] Assess the blister before choosing to drain it. [step] Not every blister needs to be lanced. In fact, some experts recommend that you should only drain blisters that are exceedingly painful, in weight-bearing or high-contact areas, or larger than 0.8 inches (2 centimeters) in diameter. <sep> (A) [substeps] If the blister is intact and manageable, try to keep it intact. Apply a piece of moleskin, adhesive felt, or tape. (B) In these instances, you need to check the blister to determine if it needs a leak-proof drain. [substeps] See the " how to drain a blister " section of this article for instructions. (C) [title] Make a decision whether or not to drain the blister. [step] If the blister is very painful, medical sterilization is an option. (D) [substeps] There is no one right way to do this, so you have to be sure that you have the right technique. It is not as easy to clean a blister as to rinse with water and applying a sterile dressing.
A

[header] How to set up a grid tied pv system at home [title] Consider how much electricity your family really needs each day or month. [step] This is important because the system includes a few solar panels and each of them has a certain amount of capacity in generating electricity. If you have a clear calculation of this problem, you won't waste your budget for purchasing these panels or buy less than needed. <sep> (A) A good system is able to produce at least 2 or 3 lights. It may (and sometimes) be enough to keep your line charging at about 200 iu or 180 usd. (B) If you want them to grow and produce faster, you'll need a system that requires a constant constant supply of electricity. The amount of electricity the individual physical systems need depends completely on how fast they are developing. (C) [title] Make sure you have a certain amount of cables to be used to connect the grid and pv systems. [step] This will need to be the maximum connection from the other solar panels. (D) Maybe you don't know about how much electricity your family needs each day or month because you just pay the bill with money. This time you can check out this figure by viewing the power meter installed in your house.
D