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".

Example input: [header] How to create a christmas tree forest [title] Consider the type of tree you want to plant. [step] There are a wide variety of christmas trees and include fir, pine, spruce, cypress, and cedar. These trees thrive in different climates and look different from one another. <sep> (A) It is important to research the tree before setting up your tree to try it out to make sure you can write the tree's growing season so that you can get the most supplies you need. If you're just interested in having a tree stand out, then make sure to check for the following : [substeps] Spruce trees. (B) [substeps] Trees green may be used in a mix of green and evergreen. Greens, such as pintos and olive oil, may be more delicate than these. (C) Where the trees grow together is up to you. [substeps] Spruce trees light up the night for hours in the morning and drown out the morning sunrise between afternoons. (D) Think about where your tree forest will be located and choose a tree that can thrive in that climate. [substeps] Balsam firs are a popular christmas tree species that grow in the northern united states and canada, in hardiness zones 3-5 or states like minnesota, north dakota, and montana.
Example output: D
Example explanation: This is a good example. Only option D is about Christmas trees. So, it's the correct option.
Q: [header] How to prevent spotting between periods [title] Take birth control pills. [step] Oral contraceptives, or birth control pills, are frequently used to manage spotting. Birth control pills regulate the hormonal changes that occur during your menstrual cycle. <sep> (A) [substeps] Birth control pills can help to establish a regular cycle and avoid overgrowth of the uterine lining in women that do not routinely ovulate. In women that do ovulate, birth control pills work to treat abnormal, heavy, or excessive bleeding during menstruation. (B) These include, but are not limited to, pregnancy hormones, mood stabilizers, herbal birth control pills, anti-depressants, or selective serotonin reuptake inhibitors. [substeps] They come in pill form, to relieve cramps or flushing outfills. (C) They may increase menstrual cramps, tense the uterus (still known as a uterus), and make it difficult to get pregnant. [substeps] There are no known side effects associated with the hormonal changes. (D) Studies suggest that estrogen levels are higher on oral contraceptives than other forms of birth control as a result. [substeps] Oral contraceptives that suppress your body's hormonal mechanisms allow for faster ejaculation and progesterone production.
A:
A