Advertising costs as a percentage of sales revenue for soft drink brands with large market shares (such as Coca-Cola and Pepsi-Cola) are lower than for brands with small market shares (Dr. Pepper, Schweppes, Fresca). This is because:

	A.	Big brands can negotiate lower rates with advertising agencies and media owners
	B.	Advertising campaigns are subject to a large minimum budgets (indivisibilities)
	C.	Economies of learninglong-established brands such as Coca-Cola and Pepsi have learned how to be more efficient in their advertising campaigns
	D.	None of the above.