Definition: 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 stretch for free running [title] Do the triangle pose in yoga. [step] The triangle pose delivers an excellent full body stretch. The pose also strengthens the legs and develops a strong back. <sep> (A) It may also improve your, which improves your overall form and strength, and force you to move and run more comfortably. [title] Do a the triangle pose in taekwondo. (B) To do the triangle pose, lie on your back on a yoga mat with your legs straight out in front of you. Allow your neck to hang out and your chest to remain vertical throughout the pose. (C) As you rotate your body to assume the final pose, keep you head, butt and ankle in a straight line. Repeat on either side to stretch both sides of your body. (D) [substeps] Work slowly and deliberately from side to side while standing with your arms up at your sides. Your hands should form a triangle with palms facing outward.
Output:
C