Select all that apply After World War II, the advent of the marketing concept emerged as a result of ______. (Select all that apply)
a. the opening up of production capacity dominated for years by war production
b. pent-up demand for consumer goods and services after the war
c. a desperate need to regain a normalcy of day-to-day life after years of war
d. the desire to return to the days of one-to-one marketing between firms and customers.