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 Input:
[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.

Ex Output:
B


Ex Input:
We see an animated opening screen. A child washes and dry their hands leaving the water on which and adult turns off. we <sep> (A) see a boy record himself skating on the ice. (B) see a blue information screen. (C) see two people rinse their hands off as adults wash theirs. (D) see the kids wash their hands and leave the water.

Ex Output:
B


Ex Input:
[header] How to install windows 7 on the same hard drive as windows vista [title] Buy or download windows 7 [title] Within windows vista follow these commands. [step] Start, control panel, administrative tools, computer management, storage then disk management. [title] Its now time to partition your hard drive. <sep> (A) [step] You will be asked to label files with internet access no os 7. This is useful for a file that is not hard to manage. (B) [title] Run " the apple cloud driver club-linux " from first framework level. [step] When you first install the license, you can find the following pages. (C) [step] On the beginning of the installation window window, click start button (it is located just to the right of the " connect with us " banner) then click all programs, then click " run " to run. [title] You now have a windows 7 portable partition. (D) [step] To do so, right click on your current hard drive where vista is installed (for most people it should be the " c " drive). [title] Click on shrink volume from the drop down menu (shrink volume determines the maximum disk space that is allowed for partitioning) this may take a minute or 2.

Ex Output:

D