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".
Q: [header] How to get a puppy to sleep [title] Make sure they get plenty of play time. [step] Because puppies are growing, they need at least 17 hours of sleep per day. This means that your puppy will be napping a lot throughout the day. <sep> (A) However, you can control when your puppy sleeps by developing a routine. Limit your puppy's naps to the morning, middle of the day, and the afternoon. (B) Even if they're sleeping on their back, they still need around 16 hours of playtime every day. Make sure that they get at least 6 hours of play time every day, or longer for longer periods of time. (C) Try to train your dog by playing games designed to prevent boredom. [substeps] Give your puppies toys of different shapes and sizes. (D) Puppies tend to sleep longer than other dogs. [substeps] Treats are a good way to provide treats throughout the day.
A:
A