Which of the Following Is the Best Example of the Marketing

Which of the following is the best example of the marketing concept in action?

A) A product manager tells her sales force,"The inventory in the warehouse must be sold if we are to make a profit,so redouble your sales efforts."
B) A manufacturer of industrial chemicals adapts its formulas and goes after the big consumer cleaning market.
C) A cleaning supplies firm learns that many consumers are having trouble hiring maids,so it develops a plan to offer customers complete house cleaning services.
D) An Internet retailer finds that shoppers are abandoning their shopping carts before checking out,so it promotes its $10 discount on each customer's first purchase.
E) A student group wants to hold an awards banquet,so it buys Krispy Kreme donuts and sells them to friends who want to help the club achieve its objectives.