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 an around the world exercise with an exercise ball [title] Find a soft surface, like a collection of yoga mats. [step] Put your exercise ball in the middle of this surface, making sure there's plenty of space around it for this exercise. [title] Kneel facing the exercise ball. <sep> (A) [step] Lean forward so that your upper torso touches the ball, and slowly roll so that your thighs start to roll onto it. Touch down with your arms on the other side of the ball and lift the rest of your legs off the ground. (B) [step] Stand up with feet spread apart with one foot in front of the other. [title] Scoop up the ball gently with your left hand, still keeping the ball in your right hand. (C) [step] Push away from the ball and toward the floor. Your weight should be balanced on your glutes. (D) [step] Your back should be towards the exercise ball. Your front knee should be up, your foot firmly planted, and your toes pointing towards the ball.
A