Answer:
A. Practice and get prepared
Explanation:
When you're trying to convey a certain idea to an audience that does not agree with you, a preparation is needed to ensure that you understand the thought behind their disagreement. By understanding this, you can develop a counter argument to transfer the way they think and you might change their opinion in the future.
Sometimes, you have to defend your idea under a debate setting. In such cases, your debate opponent might use some sort of tactics to make sure the audiences see some sort of flaw in your idea. In such cases, you need to make sure that your reasoning behind the idea is correct and ensure that your opponent should stay on topic during the course of the debate.