Detailed 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". 
Problem:[header] How to do the reclined bound angle pose in yoga [title] Sit up straight on a yoga mat with your legs together and extended straight out in front of you. [step] Your knees can be bent slightly if that is more comfortable for you. Your back should not be arched and your chin should be slightly tucked into your chest. <sep> (A) [title] Stretch your hamstrings in a standing position. [step] Work your hamstrings by raising your legs so that your toes are pointed and your heels point slightly up. (B) [title] Hold the pose for 15 to 30 seconds, longer if you are the beginner. [step] This will allow you to relax your shoulder muscles and your neck. (C) [title] Hold your head at 45 ° to 90 °. [step] Push your head back so that your hairline is level with the mat. (D) Your feet should be flexed with your toes pointing to the ceiling and your hands can be at your sides or resting on top of your upper thighs. [title] Bend your knees and draw your heels towards your pelvis.
Solution:
D