Which of the Following Illustrates the Marketing Concept in Action

Which of the following illustrates the marketing concept in action?

A) A young lawyer gives free legal advice to poor people.
B) A local police department organizes a "community crime watch" program in a neighborhood that has had many burglaries.
C) Several lawyers set up a group practice--so that the costs of the office and equipment can be shared.
D) All of the above.
E) None of the above has anything to do with the marketing concept.