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 groom a greater swiss mountain dog [title] Remove any obstructions. [step] When you're getting ready to brush your dog, make sure they do not have their collar or any other accessories on. [title] Take them outdoors if weather permits. <sep> (A) [step] Swiss mountain dogs benefit from the fresh air outside, so if it is too cold or snowing, try to take them out into a sheltered area for the day. [substeps] During the winter, you may want to take them into the woods. (B) [step] Whenever possible, take your dog outside before a big event. During peak periods, your dog is likely to be exposed to a lot of sun or heat and can easily become overheated even during the summer when temperatures are extremely hot. (C) [step] Do not take your dog in a park or in a wooded area. There is no need to brush their fur unless you are trained or have a cat. (D) [step] Greater swiss mountain dogs are a very large breed and can shed a lot during certain periods of the year. Plan to brush them outdoors, or in an indoor area that is easy to sweep, like a tile or hardwood floor.
Output:
D