Detailed Instructions: 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".
Q: [header] How to make a hamster playground [title] Get medium or large cardboard boxes. [step] Use either two large cardboard boxes or four medium sized boxes. Go to a nearby store, or ask your parents to take you. <sep> (A) A larger box should take up less room than a smaller one. If you don't mind going a bit longer, then use a larger box. (B) Try to find boxes that are as clean as possible. [substeps] If you want a pen with higher sides, go with four medium boxes. (C) [title] Cut the pieces of cardboard to size. [step] Then use glue to attach to the sides, and the flaps to the bottom so that the hamster springs out of those boxes once it gets to the outside. (D) [title] Keep the box low to the ground to let it touch the ground. [step] Rock it when it is full with soil, and water it when it is full of loose soil.
A:
B