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 teach your kitten to be calm and relaxed [title] Pick the right age. [step] Kittens are most easily socialized between the ages of two to seven weeks. This means that the kitten is more likely to accept new animals, peoples, and situations during this age range. <sep> (A) Although most respectable mother cat owners won't separate the kittens from the mother until the age of eight weeks, this falls outside of the proper time frame. This means that it is typically the original owner's job to socialize the kittens while she is still with the litter and her mother. (B) She can only learn to be calm and relaxed by age 10 or less. [substeps] As a kitten ages, it's much more likely that she'll adjust to the new situation, and will notice more aggressive adult behavior, as well as feline behavior. (C) [substeps] At the 7-week mark, the kittens will be much calmer and more relaxed. Kittens tend to interpret the coming day, so it's important that you wait for a schedule that works for you. (D) [title] Introduce the kitten to the litter box. [step] Once you've picked the perfect age for the kittens to begin the association, wait until the kitten gets used to the routine of the litter box.
Output:
A