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 treat mites in chinchillas [title] Separate your chinchilla from other pets. [step] Place your chinchilla's cage in a room where other pets don't go. With a little luck, you can reunite your chinchilla and your other pets in a few weeks. <sep> (A) This may prevent mites from re-infesting your nest and lead to your chinchilla finding everything it needs. [title] Change to a warm, dry environment. (B) [substeps] Try to put as much distance between your chinchilla and other pets. Don't move toys or other objects from your chinchilla's cage to another pet's cage without cleaning them. (C) This works best with small to medium chinchillas. [substeps] When traveling your chinchilla should be kept indoors, because space can get thin. (D) When you wait, walk around or put your chinchilla in another room. Do not let it out for a day or so without checking on it.
Output:
B