Rita buys a Sports Grill franchise. Sports Grill requires that its franchisees buy its products for every phase of their operations. Because Rita wishes to buy less expensive products, she challenges the requirement. Her best argument is probably that the requirement violates.

the federal antitrust laws.

Explanation:

The antitrust laws are federal laws that check and prohibit unlawful or illegal activities by business firms. It comprise of three major antitrust laws namely the Sherman Antitrust Act, the Federal Trade Commission Act and the Clayton Act.Through federal antitrust laws, courts are enforced to check illegal affiliations or conducts by apprehended business firms.Here, Rita challenging the requirement of sports Grill Franchise to buy its products for every phase of their operations can be challenged in the court through the federal antitrust laws.