In a two-week marketing analysis, McDonald’s was interested in finding out the popularity of the Big Mac. Using the realized/fundamental niche concept of community ecology, what should the marketing researchers do? A) Study the sales of McDonald’s restaurants that are in close proximity to other fast-food restaurants. B) Serve only Big Macs at McDonald’s and analyze the sales. C) Remove the Quarter Pounder from the menu and see if Big Mac sales increase. D) Serve Big Macs without the special sauce to see if sales go down. E) Serve Big Macs during breakfast hours.