The best answer is C. Customize product catalogs and emails to customers according to their specific requirements. The allocation of resources follows the economic theory of supply and demand and you only maximize your profits when you understand your costumer's needs. In order to make the best judicious manner in attending your costumers you have to deliver the best service possible, one good way of achieving this task is a personalized marketing approach. By doing that, you will not only know your costumer better, but you will also allocate the best resources towards your costumer, because you will know what your costumer really wants.