Why Do Department Stores Organize Some of Their Categories Around

Why do department stores organize some of their categories around national brands as opposed to the traditional classification scheme?

A) Merchandise can be purchased and coordinated around a central theme
B) Sales are unpredictable and retailers prefer a sure thing with national brands
C) National brands are much more profitable for the retailer than the private brands
D) It is ethical for retailers to support their vendors by selling their national brands
E) It is helpful to the vendors as they can make their quotas in department stores