Which of the Following Statements About the Marketing Concept Era

Which of the following statements about the marketing concept era is most accurate?

A) The marketing concept era can trace its roots to early Greek culture.
B) During the marketing concept era, companies tried to satisfy the needs of consumers while also achieving their goals.
C) During the marketing concept era, companies began to implement the idea of a marketing program.
D) During the marketing concept era, companies believed you could produce as much as you wanted because the product would sell itself.
E) All U.S. firms are now operating with a marketing concept philosophy.