Suppose the Tidy Laundry Detergent Company, which sells 40% of all detergent, is thinking about raising its price. Before Tidy makes the change, they analyze the likely responses of the All-Clean Detergent Company, which sells 35% of all detergent, and Cheerful Detergent Company, which sells 20% of all detergent. Tidy's behavior shows: a. collusion. b. mutual interdependence in pricing decisions. c. difficult entry in oligopolies. d. nonprice competition