Answer:
a. federal antitrust laws
Explanation:
Based on the information provided within the question it can be said that his best argument is probably that the requirement violates federal antitrust laws. These are laws that protect consumers from different business practices that focus on preying on anyone they can. Which can be argued that Greasy Burgers is preying on Flynn since he is new in the industry and has already bought a franchise from Greasy Burgers Inc.