Given the task definition and input, reply with output. 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". 

[header] How to do exercises that enhance good posture [title] Try the mountain pose. [step] Even though it looks like you aren't doing much, this exercise is very helpful in improving posture and balance. [substeps] First, stand with your feet together and your arms at your sides press your weight evenly across the balls and arches of your feet make sure you are taking deep breaths and focusing on the present. <sep> (A) Then keeping your face tilted slightly forward press the weight of the weight of your body towards your toes. The mountain pose may sound challenging at first so try to make it fun and easy to do. (B) Raise your shoulders until your arms are completely straight, hold that position for 15 seconds, then lower your shoulders to the ground. Do three to five sets of 10 to 15 reps each. (C) Then, release all your breath and squeeze it hard through your nose. Do 10 to 15 repetitions of this exercise for 30-40 breaths. (D) Hold this position for 10 to 30 seconds [title] Do the kneeling shoulder opener. [step] This is a yoga exercise focused on stretching your upper back muscles.

D