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 get rid of stretch marks at home [title] Eat plenty of foods that contain vitamin c, if you are gaining weight, growing quickly or pregnant. [step] Some studies show that vitamin c boosts collagen production so your skin can repair itself. [title] Consider taking a vitamin c supplement if you are not pregnant. <sep> (A) [step] Vitamin c is found in foods rich in it. You can take one supplement every 1 week or better every 2 to 4 weeks for up to 7 days. (B) [step] Vitamin c is a natural supplement and may help promote scar formation. [title] Check with your doctor if you are on blood thinners or taking milk. (C) [step] A capsule of 500 mg may help prevent and improve stretch marks. [substeps] If you are pregnant, you should consult with your pediatrician before taking any supplements. (D) [step] Vitamin c is the safest serum for collagen build up and is roughly 10 %. Both the us and the uk provide a variety of supplements for pregnant women.
Output:
C