Which of the Following Is the BEST Example of Management

Which of the following is the BEST example of management thinking during the "production era"?

A) "We need to make whatever products are easy to produce."
B) "We need to find out what the customer wants."
C) "The more salespeople we have, the more we can sell."
D) "We need to work hard to sell the product to our customers."
E) "If we produce a good product, customers will find us and buy it."