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".

[header] How to set up a caique parrot habitat [title] Choose a large cage. [step] Although the caique is a medium-sized bird, it needs a great deal of space. Select a cage that can accommodate this energetic parrot. <sep> (A) New cages tend to have more cages that are more hearty and safe, as these should not be bigger than 20 square feet (36 square meters) on all sides. If you're keeping a senior parrot, choose a caique that has built in cage work. (B) When it comes to caique cages, bigger is always better. [substeps] The smallest cage for a single caique should be 24 x 24 x 24 inches (60 x 60 x 60 cm). (C) The standard size for caique quarlings are 4 inches (10 cm) and five feet wide. Add a basking bulb, separate the block of wood with coarse wood shavings and place the bottom on a cooled to room temperature examination table. (D) For a more fluid experience, a small cage that you can comfortably surround your bird in will help to make the experience more comfortable. [substeps] A second enclosure can provide the environment your bird will be inhabiting without having to create a constant environment, changing its structure and its oxygen levels.
B

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 be earth friendly [title] Plant a tree. [step] One of the simplest things to do is to buy a tree and plant it. You will help reduce co2 emissions in the air and filter out the bad particles in the air. <sep> (A) Big trees can be counted as " plants. " [title] Ask your parents to plant the tree! [step] Maybe they have a tree that's not big enough. (B) A good tree will grow about 5 feet (1.5 m) tall. [substeps] In the spring or early fall, a tree will reach up to 5 feet (1.5 m) tall. (C) Another benefit of planting a tree is that it creates a calm and peaceful atmosphere around you. [title] Planting flowers is a fun way to help the earth. (D) A tree also acts as a host for weather, so, it will help keep your environment from getting too cold. This is because it works with the environment better.
C