Pizzerias are the only restaurants that routinely record the names, addresses, and menu selections of their customers. Simply by organizing these data, they can easily identify regular, average, and infrequent customers. Ttherefore, pizzerias utilize direct-mail marketing more effectively than do other restaurants. Which one of the following, if assumed, enables the argument's conclusion to be properly inferred? ['Restaurants other than pizzerias cannot easily identify regular, average, and infrequent customers.', 'Restaurants that routinely record names, addresses, and menu selections of their customers always utilize direct-mail marketing more effectively than do any other restaurants.', 'For restaurants, utilizing direct-mail marketing requires the names, addresses, and menu selections of at least some customers.', 'Utilizing direct-mail marketing is rarely beneficial for restaurants that cannot identify regular, average, and infrequent customers.']