Which of the Following Statements About Service Marketing Is True

Which of the following statements about service marketing is true?

A) The U.S. is primarily a manufacturing economy.
B) Service marketing is a form of nonprofit marketing.
C) Most of the marketing research done in the United States focuses on the marketing of services.
D) Services account for over two-thirds of the U.S.'s gross national product.
E) In spite of the growth of service industries, most Americans are still employed in the manufacturing sector.