Sales promotion expenditures increased as a percentage of budget expenditure for a number of years, although its growth has recently slowed. Which of the following is a factor that has contributed to the growth of sales promotion expenditures?

A) many brands have come to be seen as dissimilar
B) the efficiency of advertising as a promotion has improved
C) the trade demands more deals from manufacturers
D) consumers have become less price-oriented
E) the number of brands in the market has decreased

C