In a formal discussion, A. there are no specific rules. B. no one is in charge of leading. C. facts are backed by evidence. D. feelings may be the focus.

it is actually C. facts are backed by evidence.

Explanation:

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1.   Speak with conviction.

2.  Don't downplay an idea by treating it like a mere suggestion.

3.  Speak with intention.

4.  Make it a conversation.

5.  Come prepared.

6. Get to the point.

7. Speak quieter, not louder.

8.   Listen more.

9.   Pay attention to body language.