Why do retailers promote their less-expensive private label brands over the more-expensive national brands on their shelves?

a. Because national brands benefit from the sale of private label brands.

b. Because the companies that produce private label products pay the retailers more for these promotions.

c. Because the private label brands actually make more money for the retailer than national brands do.

d. Because private label brands are always better quality than national brands.

e. Because retail stores do not negotiate prices or placement with national brands.