Aperson in a group who keep the conversation on track is referred to as a(n)

 The correct answer is :  administrator

Explanation:  Also called facilitator, it must be someone who knows the subject, who has group experience. This person creates an environment for good communication, keeps the discussion focused, keeps people engaged, advances the issue, provides the opportunity for all people to be heard, creates an environment of trust.

well considering i can't see the graph, it's probably prices