Rick Johnson trains his company's sales force to go after the consumer. He repeatedly asks his team to bear in mind the essential fact that it is the sales team's responsibility to rouse the consumer's interest and make him feel that he needs the product. A true salesman is one who can convert an indifferent consumer walking into the store into a new customer. Johnson believes in the ________ concept.
A) product
B) production
C) selling
D) marketing
E) social responsibility
Answer: C