Write the next sentence in the following story.

How to do yoga for leaner legs
Start in downward-facing dog.
Downward-facing dog is a good place to start for working your legs because you can move into a number of leg-working poses from it. Get on your hands and knees and stack your shoulders over your wrists and your hips over your knees.

Pick from:
[A]. Clasp your hands together above your head at a 90 degree angle. Slowly bend your knees and straighten them forward..
[B]. Press your hands down into the mat and engage your shoulders to stay in the shoulder joint. Slightly tuck your back toes under and begin to lift your hips up and back..
[C]. You can either sit on the floor with your legs straight in front of you or you can stand and straighten yourself with one leg. If you prefer as you are in downward dog, keep your back straight rather than rigid..
[D]. Lower your heels as far as you can to below your hips, until your back is straight and you're able to keep your hips centered over your shoulders. Do 10 to 15 repetitions of downward-facing dog... The answer should be
[B].