Answer:
The best answer to the question: If they did not care about any future relationship they might have, had lots of money, and just wanted to prove they were right, they should:___, would be: Litigate.
Explanation:
Litigation is defined precisely as a legal contest, an argmentation that is taken usually before the courts, in order to settle a matter that is being argued upon, by two or more sides. However, the process of litigation requires more than just two people arguing; it requires lawyers, and judicial processes, which are pretty expensive. Aria and Rick wish to establish if either of them breached a contract and since neither is going to give in and accept that the other might be right, if they had the necessary money, and did not fear that a future relationship between them might be damaged due to such proceedings, then they would choose litigation as their means of solving the issue and proving they were right.