Definition: 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".
Input: [header] How to decorate a pet rat cage [title] Find a house or nest for them to sleep in. [step] Rats like having a little home to sleep in when they're tired--you'll find that if you don't have a house in their cage, your rats will sleep in a corner or near the sides of the cage, usually not flopped out in the middle. In the wild, rats have burrows. <sep> (A) It's the same with domesticated rats. Instinctively, they like to have a cozy little place to sleep in. (B) Rats burrow into dark spaces so that their parents can't see their burrow. [substeps] If you do decide to use a house, make sure it can accommodate them. (C) Rat nests are essentially small holes in the ceiling. You can go about finding rat houses in basements of a large house to suit your rats. (D) Rats find hiding in yards, in the woods, or under the furniture works well. The burrow can also help with this problem.
Output:
A