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 monitor newborn kitten growth [title] Give the kittens a warm bed. [step] During the first two weeks of their lives, kittens are helpless: their eyes will still be shut, and they should spend about 90% of their time sleeping and eating. As long as the mother cat is feeding the kittens, your involvement will be minimal. <sep> (A) On average, kittens between the ages of six and ten months old should begin to experience a warm, fluffy bed once they start to realize that they are still comfortable together. [substeps] Most breeders who sell animals produce a variety of stimulant items. (B) [substeps] During the third week, gently remove the mother and place her on your lap with her eyes shut for at least 60 minutes. Use a humidifier to help ensure their stools do not dry out. (C) The kittens' main source of warmth will be their mother. You can, however, line the box or cat carrier with a towel which can be soiled and washed. (D) Do not pick up or play with the kittens. [substeps] Never ever pick up a kitten between its legs.
Output:
C