Which of the Following Is a Drawback for a Retailer

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

A) Retailers view national brands as a threat to private labels.
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) Retailer has to work to market national brands to make them more well known and desired by customers.