Write the next sentence in the following story.

How to become an ashtanga yoga instructor
Build your skill set.
Becoming a certified yoga teacher will require you to already be familiar and skilled with the form of yoga you practice. Certification courses will likely be intensive and would not be well suited for a beginner.

[A]. Make sure you already feel confident in your knowledge and skill with yoga before seeking to become a certified yoga teacher. You should have a working knowledge of things like the asanas, pranayamas, chants and mantras associated with ashtanga yoga.;
[B]. If you choose to work through a new practice, such as a balance yoga certification act, you will learn how to be effective in yoga-it's easy to make a mistake when your first attempt will probably result in a viable assignment. Consider learning how to practice the yoga icon.;
[C]. Your focus might be to develop the most basic skills to learn more and be able to respond to problems without the help of a instructor. You can expand your training based on teaching your students in various forums, or by teaching yoga in multiple practice settings.;
[D]. You will need to cultivate your skills before you begin your career. Yoga is a side-effects of becoming an ashtanga yoga teacher.;. The answer should be
[A].