Question

The__of a discussion keeps the group on track

1) speaker
2) listener
3)moderator
4)overseer

Answer 1

3. The moderator

Hope this helps! :) 

Answer 2

Hey there!!

Okay the person that would best fit this description is the moderator. A moderator is someone who would watch over or preside over a discussion, but will also make sure the group as a whole stays on target. 

I hope this helps! ^__^