Large,packaged Goods Marketers Like Procter & Gamble,Kraft,and Pillsbury Have Used

large,packaged goods marketers like Procter & Gamble,Kraft,and Pillsbury have used the product manager (or brand manager) system of marketing organization and implementation.Which of the following is the key advantage of this system?

A) Product managers have relatively little authority.
B) Product managers are short-term in their orientation.
C) Product managers have direct responsibility for research and development of new products.
D) Product managers assume profit-and-loss responsibility for the performance of the product line.
E) Product managers have line responsibility over sales managers.