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 feed a pregnant or nursing cat [title] Switch your cat to a wet kitten food. [step] Towards the midpoint of your cat's pregnancy, begin switching her onto a high-quality wet kitten food. Kitten food contains higher percentages of nutrients and vitamins than do adult cat foods, and will provide the queen with more of the protein and calories she needs during pregnancy. <sep> (A) [substeps] Keep in mind that your cat's food consumption will increase during pregnancy. She'll usually eat about 50% more than she would when not pregnant. (B) [substeps] Kittens are at the peak of production because of that. If she loses weight, but stays healthy, the larger the portion of that food she eats, the better (approximately how long she will stay underweight). (C) [substeps] If your cat couldn't have a dry cat food, you may have to come up with an alternative. Don't restrict your cat to a wet or kitten food diet. (D) You should start feeding your cat frequent cat food at around one to two weeks of age. During this time, you should make sure she is getting the nutrients she needs, including iron, potassium, or calcium.
Output:
A