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". 
Input: [header] How to prepare for a new pet hamster [title] Choose the right cage. [step] The first thing you'll need for your hamster is a cage. However, you should give some consideration to the type of cage you choose as this will be the primary habitat for your new pet. <sep> (A) Some cages are better than others, and certain cage designs may be downright unsafe for hamsters. [substeps] Wire siding allows hamsters to climb up the walls, which can help satisfy their curiosity and burn off some energy. (B) A humane cage is a good choice, as it allows your hamster balance between a comfortable surface and a toxic environment. Many pet stores sell non-toxic cages, which you can easily change. (C) Ask the pet store if they have a reliable, enclosed outdoor cage to accommodate an already large hamster. [substeps] Don't worry about good quality cages because most stores will store plenty of parts of the old one, including food or water dishes, bath toys, bedding, toys with twists and turns, etc. (D) This should include the following factors : [substeps] Sheer temperature. It should be warm enough for your hamster to lie and sleep comfortably.
Output:
A