Instructions: 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".
Input: [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.
Output:
B