You will be given a definition of a task first, then some input of the task.
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 measure dogs for coats [title] Gather your supplies. [step] Since you'll be measuring the dog's girth and length, you'll need a measuring tape, pencil, and paper. It may also help to have someone assist you in holding the dog steady while you take the measurements. <sep> (A) [title] Mark the distance between the shoulder blades and neck. [step] The neck measurement starts with the shoulder blades and ends with the shoulders. (B) [substeps] Have the person assist you with wrapping both the measuring tape and the paper around the pup so you have two devices for measuring. If the dog is especially heavy, plan on using a backpack or briefcase to support the dog. (C) [substeps] For a dog with shorter coats and fur, going with an adult can be a great idea, as you can have someone hold the dog on one arm while you make these measurements. For a more experienced poodle, either have a girl or a boy hold the dog while you work out. (D) [substeps] Have plenty of treats available that you can use to reward your dog and encourage him to hold still. [title] Locate where to measure your dog's girth.
Output:
D