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.
If the assumption that restaurants that routinely record names, addresses, and menu selections of their customers always utilize direct-mail marketing more effectively than do any other restaurants is made, then the argument's conclusion can be properly inferred.