Given the task definition and input, reply with output. 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 build a maze for your rabbit [title] Create the base of the maze. [step] Lay out a flat piece of cardboard to use as the base floor. Choose a piece as long as the maze you want to make. <sep> (A) A good size to start with is two feet by two feet. As you perfect your maze-making skills, you can get more adventurous with bigger sized mazes. (B) Print this out on construction paper, and lay it all out on a flat surface. [substeps] Ensure that you have a spot in your maze for your rabbit to make lots of space. (C) [substeps] The base is symbolic and represents elements important to the rabbit's environment. It can be as small as a stake or even a cardboard box. (D) For example, if you want to make a spiral maze using cardboard, use 16 strips of cardboard. By using longer strips, the maze is less stable and less likely to run out of space.
A