Answer:
A. arbitration.
Explanation:
Arbitration refers to the private process in which a conflict is brought before one or more arbitrators who make a final decision on it, by consent of the parties. The parties rather than going to court, agree for an alternate dispute settlement method when selecting arbitration. the condition of the arbitration requires both parties to agree to it and select the arbitrator with mutual consent. As per the question, Joe and Stan agreed to involve a third party to settle their difference is an example of arbitration.