It can be inferred from the passage that some channel flow diversion might be eliminated if A. profit margins on authorized distribution of goods were less than those on goods marketed through parallel importing B. manufacturers relieved authorized channels of all responsibility for product promotion C. manufacturers charged all authorized distributors the same unit price for products regardless of quantity purchased D. the postsale service policies of authorized channels were controlled by manufacturers E. manufacturers refused to provide the "extended product" to consumers who purchase goods in the gray market