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 swollen feet during pregnancy [title] Stretch your legs. [step] Put your feet up as often as you can during the day and stretch your legs. You should flex your feet, do calf raises, rotate your feet, and wiggle your toes. <sep> (A) Try not to press the stressed or sore joints and make sure you know how to properly rotate your legs. [substeps] Flex your toes by using a heel or push on the heel of one foot. (B) These stretches and gentle walking can all pump blood back into your feet to prevent swelling. Try to avoid long periods of sitting or standing. (C) Massaging your legs can help relieve your stress and ease your tension. [substeps] Do this every day before you want to stretch. (D) Try to stretch your feet as often as you can throughout the day to decrease swelling on your feet. [substeps] You should also try jumping up onto a yoga mat or a chair.
A:
B