Which of the Following Is a Drawback for a Retailer

Which of the following is a drawback for a retailer offering national brands?

A) Retailers view national brands as a threat to private-label brands.
B) Retailers have to discount some national brands in order to attract customers to their stores because customers compare prices for these brands across stores.
C) Significant investment is needed to develop relationships with national brands' vendors.
D) Retailers have to work to market national brands to make them better known and desired by customers.
E) Many customers will only patronize retailers that sell particular national brands.