Joe runs a restaurant. He pays his employees $$200,000$ per year. His ingredients cost him $$50,000$ per year. Prior to running his restaurant, Joe was a lawyer earning $$150,000$ per year. What would economists say is Joe's cost of running the restaurant? $$ A$.$ $$150,000$ B$.$ $$250,000$ C$.$ $$400,000$ D$.$ $$200,000$