Answer:
The correct answer is A
Explanation:
Mediator is the one who attempts to guide or bring the conflict or decision to an end. So, when it is appeared to the negotiations that it is going in wrong direction or way, they bring a mediator.
And arbitrator is the one who reviews the evidence presented in order to resolve the issue by issuing a decision. So, an expert will serve as facilitator to get the negotiations on track, they solicited an arbitrator.