From an Economic Perspective,advertising Might Lower the Cost of a Product

From an economic perspective,advertising might lower the cost of a product by:

A) creating barriers to entry for less efficient and smaller firms.
B) moving consumers to the consumer socialization stage of the buying process.
C) making it possible for firms to realize economies of scale through expansion of sales volume.
D) allowing firms to advertise at high levels along with competitors.
E) creating brand loyalties and by helping to retain more customers.