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 establish a curfew with your child [title] Decide on an appropriate curfew. [step] This should take into account when your child gets sleepy, age, and how long they typically nap during the day. Younger children need more sleep than older children or adults, but each child will vary in how much sleep is needed and you need to take this into account when making your decision. <sep> (A) [substeps] Many teens need eight hours of sleep per night, depending on the age group. Some may not need 10, but consider adding it if you are trying to establish a curfew of 12 hours. (B) [substeps] Typically, children need a minimum of eight hours of sleep per night. The more hours your child gets, the more sleep they'll need each night. (C) [substeps] If you have a sleep schedule and don't know how much time you have before bedtime, you might have to track the time. If your child is actually getting sleepy, you'll need to adjust your schedule. (D) [substeps] This step should not involve your child. [title] Tell your child about the curfew.
Output:
D