Which of the Following Best Explains What the "Marketing Concept

Which of the following best explains what the "marketing concept" means?

A) Firms should spend more money on marketing than they have in the past.
B) A firm's main emphasis should be on the efficient utilization of its resources.
C) All of a firm's activities and resources should be organized to satisfy the needs of its customers--at a profit.
D) A company's chief executive should previously have been a marketing manager.
E) A firm should always attempt to give customers what they need regardless of the cost involved.