Why Would General Motors Switch to an Incentive-Based Compensation System

Why would General Motors switch to an incentive-based compensation system with several of its agencies?

A) to encourage its agencies to use more mass media advertising
B) to encourage its agencies to stop using network TV advertising
C) to save money on advertising
D) to encourage its agencies to look beyond traditional mass media advertising and develop other ways of reaching consumers
E) to accomplish all of the above objectives